Answer: their shapes and spacing.
- A their shapes and spacing
- B just their colour
- C just their temperature
- D just their resistance
Correct answer: A. their shapes and spacing
Explanation: Mutual inductance depends on the coils’ shapes, sizes and how they are placed relative to each other.
As a magnet approaches a coil, flux rises steadily and a constant non-zero EMF is induced (Faraday's law). Once the magnet stops moving, flux stays constant and the induced EMF drops to zero - EMF only exists while flux is actively changing.
Concept context
Faraday's and Lenz's laws, motional EMF, self/mutual inductance, eddy currents, and the AC generator - how a changing magnetic flux creates an electric current.