The Motor Effect (AQA GCSE Physics: Combined Science)

Figure 1 below shows a straight current carrying wire. The current is coming out of the page.

Figure 1

[2 marks]

[1 mark]

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Figure 2 below shows a straight wire passing between the poles of two magnets.

Figure 2

When a current passes through the wire a force is exerted on the wire.

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[4 marks]

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[3 marks]

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[3 marks]

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The apparatus shown in Figure 3 below can be used to measure the force acting on a current-carrying wire placed in a magnetic field.

Figure 3

The balance is initially zeroed so that when the power supply is off, it shows no reading.

When the power supply is turned on, the balance shows a reading.

As the current is increased, the reading increases.

[4 marks]

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[4 marks]

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Figure 4 below shows a simple d.c. motor.

Figure 4

When a direct current is supplied to the coil, the coil starts to spin.

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[3 marks]

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[2 marks]

Figure 6 below shows an electric bell.

Figure 6

When the switch is closed, the bell rings continuously.

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[2 marks]

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Figure 1 shows a device known as a current balance.

Figure 1

The switch is closed. Describe and explain the subsequent motion of the section of wire labelled A to B.

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Figure 1 shows a wire passing between a North and South pole, with a flux density of 0.10 T between the poles.

The magnets cover 30 cm of the wire's length.

The wire has a resistance of 0.2 Ω and dissipates 5 J of energy every second. 

The current travels out of the plane of the page.

Figure 1

Calculate the magnitude of the force on the wire and state its direction.

Give your answer to 2 significant figures.

[5 marks]