Question

A coil of wire is connected to a galvanometer and the north end of a magnet moved towards the center of the coil causing the needle on the galvanometer to deflect. If the south pole of a magnet is moved away from the center of the coil the needle on the galvanometer would deflect in the same direction.

a. True
b. False

Answer 1

a. True

Explanation:

In electromagnetic induction, the induced current always try to oppose the action that produces the induction (Lenz law). The approaching north end of the magnet will induce a current on the coil that will flow in an anticlockwise direction in the current (which induces a magnetism with the equivalent of a north pole of a magnet). The action of this induced current repels the magnet, in an effort to stop the motion that is producing the electromagnetic induction. When we also move the south pole of the magnet away from the coil, it induces an anticlockwise current in the coil, which tries to attract the south pole of the magnet so as to prevent it from moving. So both actions produce currents that flow in the same direction, which means that the needle of the galvanometer will deflect in the same direction.

Answer 2

a. True

Step-by-step explanation:

In electromagnetic induction, the induced current always try to oppose the action that produces the induction (Lenz law). The approaching north end of the magnet will induce a current on the coil that will flow in an anticlockwise direction in the current (which induces a magnetism with the equivalent of a north pole of a magnet). The action of this induced current repels the magnet, in an effort to stop the motion that is producing the electromagnetic induction. When we also move the south pole of the magnet away from the coil, it induces an anticlockwise current in the coil, which tries to attract the south pole of the magnet so as to prevent it from moving. So both actions produce currents that flow in the same direction, which means that the needle of the galvanometer will deflect in the same direction.