Question

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

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

Hint:

Mutual inductance depends on the geometry, orientation, and coupling of the coils, not on the material of the wires.

Answer 1

The Correct Option is B

The mutual inductance between two coils is defined as:

\[ M = \frac{\Phi}{I}, \]

where \( \Phi \) is the magnetic flux in one coil due to the current \( I \) in the other coil.

The mutual inductance depends on:

• The relative position and orientation of the two coils (determines the coupling of magnetic fields).
• The number of turns and dimensions of the coils.
• The magnetic permeability of the medium between the coils.

It does not depend directly on the current or the material of the coil wires.