Answer: Geometry and material only.
- A Current through it
- B Voltage across it
- C Geometry and material only
- D Both current and voltage
Correct answer: C. Geometry and material only
Explanation: Self-inductance L depends on coil geometry (number of turns, area, length) and core material, not on current.
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.