DP Physics (first assessment 2025)

Question 20N.1A.SL.TZ0.16

Date	November 2020	Marks available	[Maximum mark: 1]	Reference code	20N.1A.SL.TZ0.16
Level	SL	Paper	1A	Time zone	TZ0
Command term		Question number	16	Adapted from	N/A

16.

[Maximum mark: 1]

20N.1A.SL.TZ0.16

What is the relationship between the resistivity $ρ$ of a uniform wire, the radius $r$ of the wire and the length $l$ of the wire when its resistance is constant?

A. $ρ \propto r^{2} l$

B. $ρ \propto r l^{2}$

C. $ρ \propto \frac{l}{r^{2}}$

D. $ρ \propto \frac{r^{2}}{l}$

[1]

Markscheme

Examiners report

It was pointed out on the G2s that the proportional symbol is incorrect. The high number of correct responses indicates that it did not disadvantage the students and will be corrected for publication.

Syllabus sections

B. The particulate nature of matter » B.5 Current and circuits

Question 20N.1A.SL.TZ0.16

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