Question

Two circular coils can be arranged in any of three situations as shown in the figure. Their mutual inductance will be:

• A. maximum in situation (i)
• B. maximum in situation (ii)
• C. maximum in situation (iii)
• D. same in all situation

Answer 1

The correct option is A maximum in situation (i)

Mutual induction $\propto$ flux linkage between coils

• Flux linkage in coil $\left(i\right)$ is maximum because both coils have same axis.
• Flux linkage between coils is 0 because thus axis are perpendicular to each other.
• Flux linkage between coils is 0 because their axis are perpendicular to each other .

So, mutual inductance between coils is maximum in case $\left(i\right)$.