Question

Imagine if the current in the primary coil of a transformer becomes steady, then what happens to magnetic field?

• A. It becomes infinity.
• B. It gets halved.
• C. It becomes zero.
• D. It becomes constant.

Answer 1

The correct option is D

It becomes constant.

An emf is induced only when there is a change in magnetic field and hence when there is flow of AC current.
The magnetic field is constant when the current is steady or when the current is flowing in only one direction (DC current).