Mutual inductance of two coils can be increased by _____

Options

A. decreasing the number of turn in the coils.
B. increasing the number of turn in the coils.
C. winding the coils on wooden cores
D. none of the above.

Answer

B

Explanation

When the number of turns of coil increases, the flux linked with coil also increases and so mutual inductance increases with increasing the number of turns.
`therefore N_2phi_2 prop I_1`
`therefore N_2phi_2 = MI_1 " " therefore M prop N_2`