Question

If there is a circular coil having n turns, the field produced is

• A. 1/n times as that produced by single turn.
• B. n times as large as that produced by a single turn.
• C. 2/n times as large as that produced by a single turn.
• D. all

Answer 1

Answer: (B)

n times as large as that produced by a single turn.

The magnetic field produced by a current-carrying wire at a given point depends directly on the current passing through it. Therefore, if there is a circular coil having n turns, the field produced is n times as large as that produced by a single turn. This is because the current in each circular turn has the same direction, and the field due to each turn then just adds up.