The mutual inductance between thetwo coils is maximum, when one coil is wound over the other. (True/False)

The mutual inductance between two coils depends on

The mutual inductance M_12 of coil 1 with respect to coil 2.

Define mutual inductance. Write its SI unit. Derive an expression for the mutual inductance of two long co-axial solenoids of same length wound one over the other.

Calculate the mutual inductance between two coils, when a current of 4.0 A changes to 8.0 A in 0.5 s and induces an e.m.f. of 50 mV in the secondary coil.

A long solenoid of length 1 m, cross sectional area 10 cm^2 , having 1000 turns has wound about its centre a small coil of 20 turns. Compute the mutual inductance of the two circuits. What is e.m.f. in the coil when the current in the solenoid chanages at the rate of 10 As^-1 ?

Explain why the coils of the resistance box are wound over themselves?