Fig. 7.1 shows a metal rod placed between the poles of a magnet. [Figure 7.1]

1. (a)(i)End A of the rod is connected to the positive terminal of a d.c. power supply and end B is connected to the negative terminal. The current in the rod and the magnetic field produce a force on the rod. On Fig. 7.1 draw arrows to show the direction of the current in the metal rod; label this arrow C,[3]
2. (a)(ii)the direction of the magnetic field that acts on the metal rod; label this arrow M,
3. (a)(iii)the direction of the force on the rod; label this arrow F.
4. (b)(i)The power supply is removed and a sensitive voltmeter is connected between the ends A and B. When the rod is moved upwards or downwards there is a reading on the voltmeter. Explain why there is a reading on the voltmeter.[2]
5. (b)(ii)The reading on the voltmeter is increased by using a stronger magnetic field. State one other way of producing a larger reading on the voltmeter.[1]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.