Chapter 13 Magnetic Effects of Electric Current – Page 2

A rectangular coil of copper wire is rotated in a magnetic field) The direction of induced current changes once in each?

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The core of an electromagnet must be soft iron because soft iron losses all of its magnetism when current in the coil is switched off.
If steel is used for making the core of an electromagnet, the steel does not lost all its magnetism when the current is stopped and it becomes a permanent magnet.
An electromagnet is a magnet consisting of a long coil of insulated copper wire wrapped around a soft iron core that is magnetized only when electric current is passed through the coil.
None of the above.

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