Q. Which metal is commonly used as electro magnet
Solution:
Soft iron is generally used for making electromagnets because it has high magnetic permeability, i.e it can easily gain magnetic properties when current is passed around the core and quickly lose when current is stopped. This is very essential in case of electromagnets since electromagnets are generally used for picking up iron loads or transporting them, in electric bells, speakers where this sort of quick transformation of properties is important. However in cases where this sort of quick changes is not required, steel may be used as the core. Steel has a low magnetic permeability and thus once attaining magnetic properties, it holds on to these properties for a long time. Hence steel is often used for making permanent magnets.
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