A coil made up of insulated copper wire is connected to a galvanometer. What will happen to the deflection of the galvanometer if this coil is moved towards a stationary bar magnet and moved away from it?
Give reasons and name the phenomenon involved.
When the magnetic flux linked with a coil changes an emf is induced in the coil. The magnitude of emf varies with the rate of change of emf in the coil. The induced emf lasts as long as there is a change in magnetic flux and vanishes when the change in flux is stopped. The direction of induced current is such that it always opposes its cause.
Answer and Explanation:
When coil is moved towards a stationary magnet, the magnetic flux linked with the coil changes and current is induced in the coil. This will cause galvanometer needle to deflect in one direction. When coil is moved away, the magnetic flux decreases and current is induced in the opposite direction therefore needle of galvanometer deflects in opposite direction. The phenomenon involved is electromagnetic induction.
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from High School Physics: Help and ReviewChapter 13 / Lesson 10