← Back to full paperPrevious questionNext question

Question 26

From Physics HL Paper 1A (May 2025, TZ2)

Grade your answerAnswer this question in practice mode and submit it for feedback.Practice under timed constraintsOpen the paper flow with timed full-exam navigation.
View source PDF page 15
  1. A circuit is created with a cell, two parallel conducting wires and a moveable metal rod of length L. When a uniform magnetic field B is directed out of the page through the circuit, the metal rod moves to the right with velocity v. The initial current in the circuit is I.
Diagram showing a circuit with a cell, parallel conducting wires, a moveable metal rod of length L, and a uniform magnetic field B directed out of the page. The rod moves right with velocity v.
Diagram showing a circuit with a cell, parallel conducting wires, a moveable metal rod of length L, and a uniform magnetic field B directed out of the page. The rod moves right with velocity v.

What is the direction of the current through the circuit and the initial force on the metal rod?

Table presenting four options (A-D) for the direction of current (anti-clockwise/clockwise) and the initial force on the metal rod (BIL sin(90°)/BIL sin(0°)).
Table presenting four options (A-D) for the direction of current (anti-clockwise/clockwise) and the initial force on the metal rod (BIL sin(90°)/BIL sin(0°)).
Direction of IInitial force on the metal rod
A.anti-clockwiseBILsin(90°)
B.clockwiseBILsin(90°)
C.anti-clockwiseBILsin(0°)
D.clockwiseBILsin(0°)

Textbook topics in this question

Review the exact course sections assessed by each question part.