Question

When the number of magnetic lines of force passing through the coil changes, current is induced in the coil.

A.True
B.False​

Answer 1

Whenever there is a change in magnetic flux associated with a coil, an EMF is induced in the coil. Magnetic flux is defined as the number of field lines passing normally through a given area. When magnetic flux changes, obviously, it means that, the number of magnetic field lines change.

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Answer 2

Whenever there is a change in magnetic flux associated with a coil, an EMF is induced in the coil. Magnetic flux is defined as the number of field lines passing normally through a given area. When magnetic flux changes, obviously, it means that, the number of magnetic field lines change.