Question

Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon

• A. the rates at which current are changing in the two coils
• B. relative position and orientation of the two coils
• C. the materials of the wires of the coils
• D. the currents in the two coils

Answer 1

Answer: (B)

The coupled flux of two coils system is used to define the mutual inductance between the coils. The mutual inductance between the coils is $M_{21}=\frac{N_2{\varphi }_{21}}{I_1}$ So it is defined as the proportionality between the emf generated in coil 2 due to the current flows in coil 1. Thus It depends on the relative position and orientation of two coils.