(b) A positive point charge +Q is positioned at a fixed point X and an identical positive point charge is positioned at a fixed point Y, as shown in Fig. 6.1.

X

+Q

A

2.5 cm

10.0 cm

Fig. 6.1

B

Y

+Q

2.5 cm

The charges are separated in a vacuum by a distance of 10.0 cm.

Points A and B are on the line XY. Point A is a distance of 2.5cm from X and point B is a distance of 2.5cm from Y. The electric field strength at point A is 4.1 × 10⁻⁵ Vm⁻¹.

(ii) On Fig.6.2, sketch the variation of the electric field strength E with distance d from A to B, along the line AB.

5

E/10⁻⁵ V m⁻¹

4-

3

2

1

0+
0

-1

-2-

-3-

-4-

-5-

1

2

3

d/cm

4

5

Fig. 6.2

Q: What topic does this question test?

This question tests Electric fields in A-Level Physics (syllabus code 9702). It is worth 9 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics Feb/Mar 2017 examination, Paper 4 Variant 2 (9702_m17_qp_42.pdf).

Question

(b) A positive point charge +Q is positioned at a fixed point X and an identical positive point charge is positioned at a fixed point Y, as shown in Fig. 6.1.

X

+Q

A

2.5 cm

10.0 cm

Fig. 6.1

B

Y

+Q

2.5 cm

The charges are separated in a vacuum by a distance of 10.0 cm.

Points A and B are on the line XY. Point A is a distance of 2.5cm from X and point B is a distance of 2.5cm from Y. The electric field strength at point A is 4.1 × 10⁻⁵ Vm⁻¹.

(ii) On Fig.6.2, sketch the variation of the electric field strength E with distance d from A to B, along the line AB.

5

E/10⁻⁵ V m⁻¹

4-

3

2

1

0+
0

-1

-2-

-3-

-4-

-5-

1

2

3

d/cm

4

5

Fig. 6.2

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