DP Physics (last assessment 2024)

Question 20N.2.HL.TZ0.c(i)

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.2.HL.TZ0.c(i)
Level	HL	Paper	2	Time zone	TZ0
Command term	Calculate	Question number	c(i)	Adapted from	N/A

c(i).

[Maximum mark: 1]

20N.2.HL.TZ0.c(i)

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.

Calculate the electric potential difference between points A and B.

[1]

Markscheme

$« \frac{W}{q} = \frac{1.7 \times 10^{- 16}}{1.60 \times 10^{- 19}} = » 1.1 \times 10^{3} « V »$ ✓

Examiners report

Most didn't realise that the key to the answer is the definition of potential or potential difference and tried to answer using one of the formulae in the data booklet, but incorrectly.

Syllabus sections

Core

Core » Topic 5: Electricity and magnetism » 5.1 – Electric fields

Core » Topic 5: Electricity and magnetism

Question 20N.2.HL.TZ0.c(i)

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