Question

In self induction, ___.

• A. an emf is induced because of varing magnetic field due to the flow of an AC through the solenoid
  
• B. the flow of a direct current changes the magnetic flux associated with the coil
• C. an emf is generated in direction opposite to applied emf
• D. the flow of an alternating current does not change the magnetic flux associated with the coil

Answer 1

Answer: (A), (C)

The correct options are
A

an emf is induced because of varing magnetic field due to the flow of an AC through the solenoid

C

an emf is generated in direction opposite to applied emf

Whenever there is a change in magnetic flux due to the flow of an alternating current in a solenoid, it generates emf in the direction opposite to that of applied emf. This phenomenon is known as self induction. Coil generates a back emf in itself as the magnetic flux linked with the coil changes. Direct current (DC) does not generate back emf.