Question

Change in the number of magnetic field around a coil induces:

• A. Current in coil
• B. EMF in the coil
• C. Frequency in coil
• D. Both A and C

Answer 1

The correct option is B

EMF in the coil

Any change in the magnetic environment of a coil of wire will cause a voltage (emf) to be "induced" in the coil. No matter how the change is produced, the voltage will be generated. The change could be produced by changing the magnetic field strength, moving a magnet toward or away from the coil, moving the coil into or out of the magnetic field, rotating the coil relative to the magnet, etc.