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The power of the battery controlling it.
The more turns of wire in an electromagnet the stronger the magnetic field.
longer= stronger
A permanent magnet (i.e. not an electromagnet) will be demagnetised by heating it.
It's directly proportional.
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One of them is how many coils go around the electromagnet. also the amout of current flow< and the type of core material.
the greater the distance the lower the reading
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