A student makes a small d.c. motor. The teacher supplies the following equipment.
- battery
- ammeter
- voltmeter
- coil of wire
- magnets
- resistor
The student is also able to use other equipment if he wishes.
Which equipment must be used?
1 )
ammeter, battery and resistor
2 )
ammeter, coil of wire and voltmeter
battery, coil of wire and magnets
4 )
magnets, resistor and voltmeter
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