3 (a) Which of these is a magnetic material? A aluminium B carbon C cobalt D copper (b) A student has - a power pack - a long piece of wire - a stiff card - iron filings Describe how the student could use this equipment to show the shape of the magnetic field produced by a current in the wire - Edexcel - GCSE Physics - Question 3 - 2019 - Paper 1

To show the shape of the magnetic field produced by a current in the wire, the student can follow these steps:

1. Set up the equipment: Connect the power pack to the long piece of wire and place it horizontally on a flat surface.
2. Introduce iron filings: Lay a stiff card over the wire and sprinkle iron filings evenly on the card.
3. Complete the circuit: Switch on the power pack, allowing electric current to flow through the wire.
4. Observe the pattern: Gently tap the card to allow the iron filings to align along the magnetic field lines produced by the current in the wire, revealing the shape of the magnetic field.

In the diagram, draw straight lines between the south pole and the north pole, representing the magnetic field lines. Make sure to draw at least three lines to show that the field is uniform. Indicate the direction of the magnetic field lines with arrows pointing from the south pole to the north pole.