DP Physics (last assessment 2024)

Question 20N.2.HL.TZ0.8c(ii)

Date	November 2020	Marks available	[Maximum mark: 2]	Reference code	20N.2.HL.TZ0.8c(ii)
Level	HL	Paper	2	Time zone	TZ0
Command term	Determine	Question number	c(ii)	Adapted from	N/A

c(ii).

[Maximum mark: 2]

20N.2.HL.TZ0.8c(ii)

The diagram shows the electric field lines of a positively charged conducting sphere of radius $R$ and charge $Q$ .

Points A and B are located on the same field line.

A proton is placed at A and released from rest. The magnitude of the work done by the electric field in moving the proton from A to B is $1.7 \times 10^{- 16} J$ . Point A is at a distance of $5.0 \times 10^{- 2} m$ from the centre of the sphere. Point B is at a distance of $1.0 \times 10^{- 1} m$ from the centre of the sphere.

(c(ii))

Determine the charge $Q$ of the sphere.

[2]

Markscheme

$8.99 \times 10^{9} \times Q \times (\frac{1}{5.0 \times 10^{- 2}} - \frac{1}{1.0 \times 10^{- 1}}) = 1.1 \times 10^{3}$ ✓

$Q = 1.2 \times 10^{- 8} « C »$ ✓

Examiners report

Even though many were able to choose the appropriate formula from the data booklet they were often hampered in their use of the formula by incorrect techniques when using fractions.

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Additional higher level (AHL)

Additional higher level (AHL) » Topic 10: Fields » 10.2 – Fields at work

Additional higher level (AHL) » Topic 10: Fields

Question 20N.2.HL.TZ0.8c(ii)

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