Question

In which case is there an induced electromotive force?

A. An electromagnet operating on direct current is held inside a second coil of wire.

B. An electromagnet operating on alternating current is held inside a second coil of wire.

C. A permanent bar magnet is held inside a coil of wire.

D. Field lines from earth's magnetic field cross the area of a coil of wire.

Answer 1

it is option B, since an alternating current generates, a variable magnetic flux

Answer 2

ohh okay! thank you:)

Answer 3

the induced electromotive force will appear across the second coil of wire

Answer 4

:)