Question

Two circular coils, having identical self inductance $L$, are placed parallel to each other with their centers along a common axis. For which given values of distance between their centers, will the value of coupling constant be maximum?

• A. $0.2\text{m}$
• B. $2\text{m}$
• C. $1\text{m}$
• D. $0.1\text{m}$

Answer 1

The correct option is D $0.1\text{m}$

The coupling constant depends on the closeness, if the two coils are placed parallel to each other with their centers along a common axis.

Closer the coils, greater is the value of coupling constant.

Hence, option $\left(D\right)$ is the correct answer.