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Uses of Magnetism (OCR GCSE Combined Science A (Gateway): Physics): Exam Questions

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Uses of Magnetism

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Uses of Magnetism

13 marks

Higher Tier Only

i) Name the rule which can be used to predict the direction of the force perpendicular to a current-carrying conductor in a magnetic field.

[1]

ii) A student places four wires of different lengths (A, B, C and D) perpendicular to different magnetic fields with different currents flowing.

Look at the table of the results.

Wire

Magnetic flux density (T)

Current (A)

Length (m)

A

0.10

2.5

0.50

B

0.15

2.0

0.75

C

0.20

4.5

0.25

D

0.25

5.0

1.00

Use the results to show that wire D experiences the highest force.

Show your working.

[2]

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2a
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Higher Tier Only

A teacher demonstrates the motor effect using the equipment shown in the diagram.

Diagram of a horseshoe magnet with a bare copper wire passing through its ends, connected to a cell and a switch in a simple electrical circuit.

A piece of copper wire, Q, is placed on two bare wires connected to a cell and switch.

When the switch is closed, wire Q moves.

Describe what happens to the motion of wire Q when the magnetic field of the magnet is reversed.

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2b
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Higher Tier Only

A current of 6.0 A passes through wire Q.

The magnetic flux density of the field is 0.64 T. The length of wire Q in the magnetic field is 0.40 m.

Calculate the force acting on wire Q.

Give your answer to 2 significant figures.

Use the Equation Sheet.

Force = ...................................................... N

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3a
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Higher Tier Only

A student investigates a simple electric motor as shown in the diagram.

Diagram of an electric motor with a horseshoe magnet, coil, and pivot. N and S poles indicated. Connected to a battery with wires forming a circuit.

(i) State the direction in which the coil turns. Put a ring around the correct option.

clockwise‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ anticlockwise

[1]

(ii) State the name of the rule you used to work this out.

[1]

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3b
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A current of 2.5 A flows in the coil, which is 0.25 m long and 0.15 m wide.

The force on one side of the coil is 0.50 N.

Calculate the magnetic flux density of the magnet.

Use the Equation Sheet.

Magnetic flux density = .................................... T

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3c
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Suggest two ways in which the size of the force on the coil could be increased.

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4
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Fig. 1.1 shows a wire passing between two poles of a permanent magnet.

Fig. 1.1

Diagram showing a wire between two magnetic poles labelled N and S, indicating a magnetic field directed downward.

The length of the wire within the magnetic field is 30 cm. The magnetic flux density of the field between the poles is 0.10 T.

The wire has a resistance of 0.2 Ω and dissipates 5.0 J of energy every second. 

The current travels out of the plane of the page.

Calculate the force exerted on the wire and state its direction.

Give your answer to 2 significant figures.

Use the Equation Sheet.

Force = .................................... N

Direction: ........................................

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