DP Physics (first assessment 2025)

Question 21M.1A.SL.TZ2.18

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.SL.TZ2.18
Level	SL	Paper	1A	Time zone	TZ2
Command term		Question number	18	Adapted from	N/A

18.

[Maximum mark: 1]

21M.1A.SL.TZ2.18

The diagram shows two cylindrical wires, X and Y. Wire X has a length $l$ , a diameter $d$ , and a resistivity $ρ$ . Wire Y has a length $2 l$ , a diameter of $\frac{d}{2}$ and a resistivity of $\frac{ρ}{2}$ .

What is $\frac{resistance of X}{resistance of Y}$ ?

A. 4

B. 2

C. 0.5

D. 0.25

[1]

Markscheme

Syllabus sections

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

Question 21M.1A.SL.TZ2.18

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