Question

If number of turns in primary and secondary coils is increased to two times each, the mutual inductance

• A. Becomes 4 times
• B. Becomes 2 times
• C. Becomes $\frac{1}{4}$ times
• D. Remains unchanged

Answer 1

Answer: (A)

Becomes 4 times

Answer 2

$M = \frac{\mu_{0}N_{1}N_{2}A}{l}$

$\therefore$ M becomes 4 times