Practice Question

1.State what Lenz’s law is

Lenz’s Law says that when a magnetic field changes near a conductor, it creates a current that makes its own magnetic field and that new field tries to oppose the original change.

2. A south pole of a magnet is being pushed into a coil. Explain why the coil repels the magnet

As the bar magnet goes into  a coil of wire, the coil of wire will cut the field lines around the magnet. This will induce a potential difference across ends of coil, if a complete circuit is present, then a current will flow. 

In this case, the current will be clockwise. Due to the current flowing through the coil, a mangetic field is created around the coil. The end of the coil that faces the magnet will become south pole, the opposite end of the coil will become a north pole. 

This will cause repulsion between the magnet and the coil of wire.

3. If a south pole of a magnet is pulled out of a coil, will the current flow clockwise or anticlockwise through the coil?

Anticlockwise