Physics · Electromagnetic induction: Faraday's law, induced emf and current, Lenz's law, eddy currents, self and mutual inductance
An induced e.m.f. is produced when a magnet is plunged into a coil. The strength
An induced e.m.f. is produced when a magnet is plunged into a coil. The strength of the induced e.m.f. is independent of
- A. the strength of the magnet
- B. number of turns of coil
- C. the resistivity of the wire of the coil
- D. speed with which the magnet is moved
Step-by-step solution
According to Faraday's law, the induced emf is given by ε = -N dΦ/dt. It depends on the number of turns (N), the rate of change of magnetic flux (dΦ/dt), which is influenced by the magnet's strength and the speed of motion. Resistivity of the wire determines the coil's resistance but does not affect the induced emf itself.
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