# COMMUNITY

### what is the specification of a magnet?

What should I ask in a shop to buy a magnet(not electromagnet )?

Asked by piku2323 8 years ago

### If you leave a magnet to a piece of metal for a long time coud it lose it's magnetism? Answered

NULL

Asked by master key 8 years ago

### What happened when we wrapped cooper wire on the magnet and pass current to the coil?

Is this increase power of magnet or not?

Asked by Pankaj q 3 years ago

### how can I magnetic distance?

So for the past month my study has been magnets (how do they work) and ive come to electromagnets. what variable/s would affect the distance of a magnetic field. or rather what produces a bigger field, higher voltage, or amperage? thin wire and many wrappings or thicker wire and fewer wrappings. also if anyone knows of any good simulations on electromagnetism they would be much appreciated

Asked by snowfox222 4 years ago

### Need assistance with an electromagnet? Answered

Hi, let's say i have a permanent magnet and an electromagnet The permanent magnet is strong probably 50-100mt, the electromagnet is week less than 10mt, (the electromagnet being just a loop of wire, nothing inside, just air) I need the electromagnet to capture all the lines of the magnetic field of the permanent magnet and thus make my electromagnet  stronger, They can be placed at a distence of 3-5mm from each other I can isolate them and put them in an environement where once activated the electromagnet would offer to the permanenet magnet a path of least magnetic reluctance Since the electromagnet is weaker (and probably has less magnetic lines) will it still be able to capture all the  lines and strength of the permanent magnet and direct it with almost no losses to the other end of the electromagnet (cause the electromagnet is quite long ) How much weaker can it be untill it becomes useless in capture and directing the entire field of the PM (10 times, 100 times)? Any advice? Thank you in advance for your assistance

Asked by Elys 2 years ago

### how do you make magneticboots? Answered

Ive been trying to figure out for a while now on how to make magnetic boots. they cant be to strong that you cant pick up your feet but yet they can be to light to make you not wana stick.

Asked by dcastens 7 years ago

### how to make most powerful electromagnet using 25 volt source?

Asked by nit1111 5 years ago

### The force of the coil without iron core Answered

Dear All..  If two coil A and B without iron core same as (size) dimension  and but coil A winding with 28 gauge and coil B with 32 gauge magnet wire Please help me to know : What is name coil more force for  attract a piece of ion metal. Many Thank you                                                                            Best regards                                                                                         lam

Asked by lam 2 years ago

### Using induction how do i transfer electrical power wireless over a short distance?

For example through a solid thick material that must not be pierced ? ( it will be more helpfull if the basic circuit block diagram is porvied)

Asked by baburam83 9 years ago

### How can i make a 10,000 guass electromagnet without spending a bundle.?

It doesn't need to be exactly 10000.  that's just my goal.   It doesnt need to be mobile and can run off 120vAC.  Conversion to DC is expected.   Essentially.  I need to try and get a handle on the math and practicality of this to understand the scale.  Any input is welcome

Asked by dggriffi 6 years ago

### Is it possible to make the magnets lose it magnetic field permanently? Answered

I know magnets can lose its magnetic properties if exposed to heat, but is there a way to make the magnets permanently lose its magnetic fields?

Asked by Plasmana 9 years ago

### magnet gravity

Couldn't, with well position magnets, create an orbit around a central magnet? Almost like perpetual motion? I've been playing around with magnets lately, and I've gotten magnets to do 2 full revolutions around other magnets before coliding. Is it possible?

Posted by guyfrom7up 10 years ago

### What is a good magnet project? Answered

I have a really strong magnet. Its a cylinder about 2cm high and 1cm diameter. What should I build with it/use it for? (Its not excessively strong, just really strong.

Asked by eggyeggyeggy 7 years ago

### how much weight would a neyodonium magnet from a hdd hold??

Asked by stephenniall 8 years ago

### i have a strong electro magnet (12V, 15watt) and like to turn it on and off really fast. how can i do this? Answered

Asked by manfred2766 6 years ago

### does anybody know where I can find strong magnets in Israel?

I am thinking about a big project that includes magnets and I would like to know where to find them in Israel where I live

### How to build one of these electro magnets?

Ive seen plans to build electro magnets where a metallic object is dangled upside down. this company inverts it so the metallic object is propelled upwards. from some of the pictures ive found it looks to be four magnets working together. any one have any info on building one from scratch? the first site below have videos of it in action. http://www.floating-lamps.com/floating-technology/ www.crealev.com

Asked by autoflow 6 years ago

### where to get thumb sized neodimiyam magnets? Answered

I want to make a speaker and i want thumb sized cilyndrical neodimiyam magnets.i live in bangladesh and radioshack or online shopping is not available.but my workshop is full of junks and can i salvage any magnet from there.i tried to buy these in shops but could not find it.please help.thanks for viewing and answering

Asked by argha halder 4 years ago

### Magnetic Table Holds It All Together

All that space under your dining room table has been going to waste... until now! Install neodymium magnets all over the place and you have an interesting concept. I'd be in constant fear of knocking a cup and saucer onto the floor with my knee, but it's not like anyone's really gonna make this and use it. Right? linkvia Gizmodo

Posted by fungus amungus 10 years ago

### Newb questions - magnets behind mirror!

Hi! I'm incredibly new here and already in way over my head! Hope this is the best place to ask this. I wanted to create a mirror that is magnetic to hold tweezers, nail clippers, etc. -  lots of little metal cosmetic bits that get lost around my home. I can't attach magnets to the items themselves because they are too small - would it be feasible to glue some rare earth magnets behind the mirror? Or will I just get a giant chunk of mirror embedded in my face? :( I'm trying to spruce my home up on the cheap and keep the small space organized. I have a sampler pack of rare earth magnets from lee valley and some framed mirrors already. If this is feasible could anyone tell me how far apart I should be spacing the magnets?  I feel like such newb! I guess I am one. But anyway, I humbly beg at your feet! Please help! Thanks folks!

Posted by Stasiasilver 5 years ago

### Magnetic Field for hollow core?

I am working on a project in which I have to control a small setup at the end of a motor shaft using an electromagnet. The electromagnet needs to be around the shaft inbetween the setup and the motor. So I have used a metallic ferromagnetic spool(image attached) and wound 32 gauge wire on it to make it an electromagnet and put the shaft through it. Since this core made out of spool is hollow, I'm not sure how the magnetic field will behave. I tried powering up the one I made and it' seems to be both attracting and repelling a magnet's pole (edges attract while centre somewhat repels). Anyone got any idea about this?

Posted by Antzy Carmasaic 5 years ago

### Touch sensor connected to magnetic lock

Hi everybody, I would like to know if anyone can help me for this idea. Indeed, I would like to create a touch sensor which will be connected to a magnet system. To be more accurate, the idea involve the same process as a touch screen phone where one needs to do a pattern with 4 touch sensitive cases . The pattern would create and electrical impulse, which would unlock the box by detaching the magnet. So in a nutshell I will need a touch sensors pattern programing that would send an electrical impulse to detached the 2 magnets. I need this system so it could help me for my 1st creation. It needs to be very small to fit in a box of altoids candy for example. As I said, as a 1st creation I am completely lost for all theses "programmation" skills required. Thank you for your help. Beniver

Posted by Beniver 3 years ago

### BIG electro magnet uses?

So i have been taking apart alot of electronics, looking for sweet pieces for my arc reactor im building and today i decided to take apart an old Goulds jet Pump.  Inside i was please to find all this coperwire. I just LOVE the look of this thing, and i know people always build coil guns and all that cool weapon stuff. There has GOT to be a cool use for this, other then giant paperweight.   Any suggestions.  Here is a photo of it.  That copper goes all the way through it. and looks the same on the other side.

Posted by valmont325 6 years ago

### How to power a strong Electromagnet?

I want to make a fairly strong electromagnet for general use but I also have a task in mind. I live in an apartment building near some students and someone egged my window. The egg dried in and now I can't reach it to clean it. I've see magnetic window cleaners before but they are cheap, weak and not up to task so I'd like to make an electromagnet to help with the scrubbing action. The windows are double glazed and the neodymium magnets I have are not strong enough. The only electromagnets I've ever made were the basic science experiment type, coiled copper around bolt with a battery to power. For this I assume I'll need a large battery or would it be mains powered? Any suggestions?

Asked by nodnodwinkwink 4 years ago

Hi I just saw something weird, it's not an exercise or a problem but I still have a question :  Let's say we have 2 electromagnets of unequal strengths X and X+Y; between them we have a ferromagnetic bar  Let's say one has south polarity and the other one north if we change which one is stronger ex 1st is X,  2nd is X+Y than a moment after 1st is X+Y and  2nd is X the bar will have the polarity of the stronger one for a moment, right? ex for a moment the electromagnet with the south pole is stronger X + Y = the bar will become south pole than we return it to its normal strength X and make the north pole electromagnet stronger X+ Y= the bar will become north pole, right? How will such variations of the strength of the magnetic field on 1 side affect the entire device, will only the bar change its polarity and it will stop somewhere on the border of the second magnet or will the second electromagnet change it's polarity too if the first one's is very strong? (just wondering) If we fix a coil on the ferromagnetic bar will such variations in the magnetic polarities of the bar induce current in it and how much, as much as we used to produce the fields of both electromagnets or only for the field of the stronger one, or only the difference between 2? and the last question in the terms of relation between the strengths of both electromagnets (let's say in %) how much Y should be to change the polarity of the bar without affecting the polarity of the second electromagnet?  Thank you all in advance for your interest, assistance and time :)

Asked by Elys 3 years ago

### What is the relationship between the range of an electromagnet and its shape/size?

I'm thinking of building a floating globe sort of thing. How do I determine what size of electromagnet I should build? The globe itself would be fairly light, so the strength at range would not be much of an issue.

Asked by MaximY 1 year ago

Could you recommend a type of magnet?

Asked by JackH72 1 year ago

### Does a magnet get attracted... Answered

Does a magnet get attracted to another magnet outside of the glass of acid while the first magnet is inside the acid?

Asked by Mr.Science Projects 6 years ago

Can all magnetics attach to any source of metal

Asked by Rantel 7 months ago

### How to make magnetic ink?

Asked by Dustc53 6 years ago

### Why would banging on a magnet with a hammer cause it to lose its magnetism?

Asked by Noodles422 6 years ago

### Electro Magnets

If an electro magnet is suspending something in an vacuum environment, will it act as a medium? (Will sound waves be able to pass through the magnetic field?) Thanks

Posted by Weissensteinburg 10 years ago

### magnet motor or not ?

Is an angle grinder motor a permanent magnet motor or not ?,

Asked by nicobotha12345 8 years ago

### Feel a magnetic force?

I was just wondering is it possible to fell a magnetic force on your skin and if so how?

Asked by Dominator57 6 years ago

### Do refrigerator magnets affect food?

Posted by Malvavisco 8 years ago

### Earth Magnets vs Electromagnets?? Answered

I have an earth magnet/ neodymium magnet that is pretty strong as far as pulling power is concerned but would an electro magnet have more pulling force or power. Its a small enough earth magnet that fits in my pocket. Thanks. AL.

Asked by alsports2000 6 years ago

### Energy wheel

This Idea is based on Magnetic Repulsion and Kinetic force. According to diagram there will be a  Wheel and a magnet(1) will be attached with this wheel. There will be a balance system(seesaw system) and two magnets(2no.magnet and 3no. magnet) will be attached with this balance system . when 1 magnet will repel 2 no.magnet then the 2 no.magnet will move upward and due to this movement the 3 no. magnet will come down and will work to repel 1 no. magnet and wheel will start to rotate. when 1 no. magnet will again repel 2 no.magnet after a rotation then the 3 no. magnet will again work to repel the 1 no.magnet. In this way the wheel will rotate again and again.The magnetic strength of 1 no. magnet will be high than 2 no. and magnetic strength of 3 no. magnet will be high than 1 no. magnet. I want to develop this technology.

Posted by vikram_gupta11 1 year ago

### how can i do a magnet that i can turn it on or off EG ( excavator magnet ) ?

Asked by m7med98 5 years ago

### If a 1 pole magnet was invented,what would it be used for Answered

Asked by Salesh 7 years ago

### how to make permanent magnet motor ? is it true it is free energy device?

I heared that permanent magnet motor works on magnet repulsion and it is free energy device that works for life time....... is it true???

Asked by rachit59 8 years ago

### Can you fill an entire room with a strong magnetic field using current technology? Answered

I had an idea, but it will only work if an entire room is filled with a magnetic field. I plan on doing this idea within 30 or so years, so you can take you time answering.

Asked by The Mollusk 9 years ago

Can an electro magnet have more gauss than a neodymium of the same size?  I was just thinking about robots and advanced prosthetics. One issue with them is they require rather bulky motors to get the lifting and holding capacity we often require. So if power wasn't an issue and you could make a small elecro magnet that has more gauss/a stronger magnetic field than a neodymium magnet. Than we could make strong and smaller motors.  Just a thought. Discuss!

Posted by mpilchfamily 3 years ago

### Where can I get a monopole magnet? Answered

I saw a video on You tube (http://www.youtube.com/watch?v=xR6Qait2JGY), in it he makes a perpetual motion machine using a monopole magnet (a magnet with only one pole North or South).

Asked by TurboFish 5 years ago

### Could several strong neos repel weaker magnets in the trunk of a car and move the car??

Asked by Jazix39 1 year ago

### what is the average gauss of a hard drive magnet? Answered

I just was wondering 'cause I have three#

Asked by nerd7473 5 years ago

### Does a neodymium magnet harm an Iphone? Answered

I tried gluing a magnet on my phone case and I experienced some problems with Compass app.Except the compass effect is it safe to use it for a longer time?

Asked by kaanthegmr 2 years ago

### magnet powered LED

Ok i remember seeing something, or maby its just a thought in the back of my head. but is there a way to make a led light up when you move a magnet by it or something like that?

Posted by yuckzee 9 years ago

### How do I know the grade of a magnet?

I salvaged two identical neodymium magnets from an old CD rom drive. They're really strong and I suspect it to be neodymium, but is there any way to ascertain the "grade" of this magnet? Neodymium grades go like N35, N33,  etc...

Asked by Power-Inside 5 years ago

### Is it possible to make a one pole magnetic sphere? Answered

I know that naturally this doesn't exist. However what if i was to take two identical domed magnets and attach them to each other (not sure how I would do this) shouldn't this create a magnetic sphere with north on the outside and south on the inside. As shown in the picture. Thanks

Asked by mikecharlie 6 years ago

### how to make magnet motor free enrgy w/o neodymium? Answered

I dont have access to buy neodymium or much parts like roms and hard drive to slavage dozen of it. all i have are craft magnets.. ceramic type i think...

Asked by No-Shi-De 7 years ago