Question

In a transformer, the immediate cause of the induced alternating current in the secondary coil is:

• A. a varying magnetic field
• B. a varying electric field
• C. the iron core of the transformer
• D. a motion of the primary coil

Answer 1

Answer: (A)

a varying magnetic field

Transformer works on the basis of electromagnetic induction, which is produced by changing magnetic flux. In a transformer both the coils are fixed and not moving thus, the change in magnetic flux is because of change in magnetic field.