Explain the magnet-and-coil induction experiment with a centre-zero galvanometer.

Solution & explanation

Connect the coil to the meter. Move a magnet toward it: a deflection appears. Hold it stationary: induced deflection falls away. Withdraw it: the deflection reverses. Reverse the magnet pole or coil connections to reverse signs, and move faster to compare emf under the same circuit conditions. The changing linked flux is the controlling variable.