What is an electromagnet, commonly used in devices like electric bells, motors, and industrial cranes?
AA temporary magnet created when electric current flows through a coil of wire, often wrapped around an iron core
BA magnet that only works underwater
CA magnet made purely from a rare naturally occurring mineral
DA permanent magnet that never loses its magnetism
Explanation
An electromagnet is a temporary magnet created when electric current flows through a coil of wire, an effect that is typically strengthened significantly by wrapping the coil around a core made of a magnetic material like iron. Unlike a permanent magnet, an electromagnet’s magnetism can be turned on or off simply by starting or stopping the flow of electric current, and its strength can often be adjusted by changing the current or the number of coil turns. This flexibility makes electromagnets extremely useful in a wide range of applications, from industrial cranes that lift and release scrap metal to the internal components of electric motors and speakers. Explore more Everyday Science MCQs on mcqstutor to keep practicing.
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