The metals in the list below have many different uses. aluminium copper iron silver steel

1. (a)(i)State which metal from the list is used for a compass needle,
2. (a)(ii)magnetic screening,
3. (a)(iii)the core of a transformer.[2]
4. (b)(i)Describe one use for a transformer.[2]
5. (b)(ii) 1.An a.c. generator supplies an input voltage of 220 V to a transformer. In the space below, sketch a graph of the output voltage against time for the a.c. generator.[2]
6. (b)(ii) 2.The transformer has 1700 turns on the primary coil and 85 turns on the secondary coil. Calculate the output voltage of the transformer.[2]
7. (c)(i) 1.[Figure 11.1] shows a magnet next to one end of a solenoid. The terminals of the solenoid are connected to a very sensitive ammeter. The magnet is moved to the right at a constant speed and a reading is observed on the ammeter. Explain why there is a current in the ammeter.[3]
8. (c)(i) 2.Explain how the current in the ammeter opposes the change producing it.[2]
9. (c)(ii)The magnet stops when the S-pole reaches the middle of the solenoid. The reading on the ammeter is observed when the magnet is moved to the left at a constant speed that is less than its speed in (c)(i). State two ways in which the reading on the ammeter differs from the reading observed in (c)(i) as the magnet moves to the left. 1. 2.[2]

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