Two flexible iron strips, WX and YZ, are placed close to each other inside a solenoid (long coil). The end W of WX and the end Z of YZ are held firmly in position. Fig. 6.1 shows that the solenoid is connected to a d.c. power supply and a switch. [Figure 6.1] The switch is closed and there is an electric current in the solenoid. End W of flexible iron strip WX becomes a magnetic S-pole.

1. (a)(i)State the type of magnetic pole produced at X, Y and Z. 1. X ...-pole 2. Y ...-pole 3. Z ...-pole[2]
2. (a)(ii)State and explain what happens to X and Y because the flexible iron strips are magnetised.[1]
3. (b)A relay operates a switch in one circuit using the current in a different circuit. State one example of a relay used in this way and explain why a relay is used.[2]

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