CAIE IGCSE Physics 4.5.4 Force on a Current Carrying Conductor Topic Practice

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Covered syllabus points

4.5.4.1—An experiment to show that a force4.5.4.2—Relative directions of force, magnetic4.5.4.3—Direction of the force on beams of

Question 1

[Maximum number: 2]

Fig. 9.1 shows a horizontal wire PQ placed in the gap between the N pole and the S pole of a magnet.

Fig. 9.1

Fig. 9.1

There is a current in the wire in the direction P to Q .
A force acts on the current-carrying wire in the magnetic field.

Question (a)

(a)

On Fig. 9.1, draw

[ 1 ]

Question (i)

(i)

an arrow, labelled F to show the direction of the force on the current-carrying wire due to the magnetic field of the magnet.

[ 1 ]

Question (b)

(b)

State the effect of reversing the direction of the current in wire PQ .

[ 1 ]

Question 2

[Maximum number: 2]

Fig. 8.1 shows the single turn coil of a simple direct current (d.c.) motor.

Fig. 8.1

Fig. 8.1

Explain the direction of the turning effect as seen by an observer at O .

Question 3

[Maximum number: 4]

Fig. 7.1 shows a small plotting compass which is aligned with the magnetic field between magnetic poles A and B of a U-shaped magnet.

Fig. 7.1

Fig. 7.1

Question (a)

(a)

Fig. 7.2 shows a wire, placed between two poles, carrying a current in the direction of the arrow.

Fig. 7.2

Fig. 7.2

On Fig. 7.2, draw an arrow to show the direction of the force on the wire due to the magnetic field.

[ 2 ]

Question (b)

(b)

Fig. 7.3 shows a β\beta-particle moving in the direction of the arrow between the same two poles.

Fig. 7.3

Fig. 7.3

On Fig. 7.3, draw an arrow to show the direction of the force on the β\beta-particle due to the magnetic field.
[Total: 5]

[ 2 ]
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