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Question 19M.1.HL.TZ1.18

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1.HL.TZ1.18
Level HL Paper 1 Time zone TZ1
Command term Question number 18 Adapted from N/A
18.
[Maximum mark: 1]
19M.1.HL.TZ1.18

Two currents of 3 A and 1 A are established in the same direction through two parallel straight wires R and S.

What is correct about the magnetic forces acting on each wire?

A. Both wires exert equal magnitude attractive forces on each other.

B. Both wires exert equal magnitude repulsive forces on each other.

C. Wire R exerts a larger magnitude attractive force on wire S.

D. Wire R exerts a larger magnitude repulsive force on wire S.

[1]

Markscheme

A

Examiners report

This question had the lowest difficulty index on the HL paper, with roughly 10 % of candidates selecting response A. Responses C and D were roughly equally common candidate answers, with students not recognizing the applicability of Newton’s 3rd law.

Syllabus sections