If a permanent magnet is moved away from a coil that forms a closed circuit, the polarity of its resulting magnetic field will
A) oppose the movement of the magnet
B) assist the movement of the magnet
C) will have no effect on the movement of the magnet

Question

Quizplus · Accepted Answer

According to Faraday's law of electromagnetic induction, when a magnet moves away from a closed circuit, a current is induced in the circuit which produces a magnetic field that opposes the direction of the changing magnetic field. This is known as Lenz's law. Therefore, the polarity of the resulting magnetic field will be opposite to the direction of the magnet's movement and will oppose it.

If a Permanent Magnet Is Moved Away from a Coil