2 (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 Combined Science - Question 2 - 2019 - Paper 1

The student can follow these steps:

1. Set up the Apparatus: Connect the power pack to the long piece of wire to create a circuit.
2. Place the Iron Filings: Position the stiff card horizontally above the wire. Sprinkle iron fillings onto the card evenly to ensure a clear representation of the magnetic field.
3. Turn on the Power: Switch on the power pack to allow current to flow through the wire. This will create a magnetic field around the wire.
4. Observe the Pattern: Gently tap the stiff card to help the iron fillings align themselves along the magnetic field lines. This will visually demonstrate the shape of the magnetic field around the wire.
5. Draw a Diagram: A diagram showing the magnetic field lines with arrows indicating the direction of the magnetic field can also be included for clarity.

To draw the magnetic field lines:

1. Draw Lines: Start by drawing a vertical line from the south pole to the north pole, indicating the magnetic field direction.
2. Equidistant Lines: Add at least two more straight, vertical lines between the poles, ensuring they are equidistant from each other and parallel.
3. Add Arrows: Finally, place arrows on each line pointing from the south pole to the north pole, indicating the direction of the magnetic field.