Fig. 6.1 shows the structure of a simple electric motor. [Figure 6.1] The current in the coil causes the coil to rotate. A student notices that the coil turns in the direction shown by the curved arrow in Fig. 6.1.

1. (a)(i)State what happens to the motor if a stronger magnet is used.[1]
2. (a)(ii)On Fig. 6.1 mark and label: • the direction of the current in the coil • the direction of the magnetic field.[1]
3. (a)(iii)Explain why the coil turns.[2]
4. (b)(i)Two vertical wires carry equal currents in opposite directions. They pass at right angles through a piece of card as shown in Fig. 6.2. [Figure 6.2] Fig. 6.3 is a view of the card from above. [Figure 6.3] On Fig. 6.3 sketch the pattern of the magnetic field produced. Indicate the direction of the magnetic field on the pattern that you draw.[3]
5. (b)(ii)The currents in the two wires cause the wires to repel each other. Explain how the current in one wire causes a force on the other wire.[2]

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