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# how to build dc electromagnet which produce 5mT of flux density? Answered

which type of core should be used.it is used in electronic circuit just to wake up data logger

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## Discussions

If the cylinder is not made of iron then you have the beginning of a solenoid.

If it is iron then you may have a lifting magnet or inductor.

I found this formula on the web.

Force exerted = (NI)^2 x 2Pi x 10^7 x Area/g^2

(NI)^2 = number of Turns * Current Squared.

Pi = 3.14159

Area = area of Coil

g^2 = distance to object Squared

You need to click the pics to see the whole image.

electromagnet is used to wake up logger .it uses 3.6v step input.

is logger a person ??

it is data logger.device used to read data like temperature and humidity etc.we just need to initiate the logger by giving a step input of 3.6v dc .field generated by the electromagnet will be sensed by the some electronic switch and it will turn on the data logger

Over what area ? To what precision ? 5mT over a soccer field is very hard. 5mT in a tube like a pencil is not. 0.01% variation is hard, 10% is not.

over an iron core solenoid of 2 inch height and 0.5 inch dia.