Uses of Magnetism (OCR GCSE Physics A (Gateway))

Higher Tier Only

A wire is placed between the poles of a magnet, perpendicular to the magnetic field lines.

Which direction will the wire move when a current flows?

Higher Tier Only

A transformer has a primary coil and a secondary coil. The potential difference across the secondary coil is double the potential difference across the primary coil.

If the primary coil has 300 turns, how many turns are on the secondary coil?

Higher Tier Only

A student measures the magnetic flux density around a current-carrying conductor at increasing distances from the conductor.

She plots her results.

The current in the conductor is decreased and a new graph plotted.

Which is the correct graph?

Higher Tier Only

The diagram shows two poles of a magnet.

X is the position of a wire carrying a current perpendicularly into the paper.

Which direction does the wire move?

Higher Tier Only

A 0.5 m length of wire is placed inside four different magnetic fields.

Which magnetic field has the greatest magnetic flux density?

Higher Tier Only

This is a diagram of a transformer used in the national grid.

Why is this transformer used in the national grid?

Higher Tier Only

Which of the following graphs shows the typical output potential difference, V_out, for a dynamo?

Higher Tier Only

A wire is placed inside a horseshoe magnet.

Which direction will the wire move when the switch is closed?

Higher Tier Only

What output voltage does the transformer produce?