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4.2 Uses of magnetism

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Question 13
H

A current-carrying wire is at right angles to a magnetic field. The force on the wire is upwards.

The direction of the current and the direction of the magnetic field are both reversed.

What is the force on the wire now?

[1]
A

Downwards, because reversing the current always reverses the force

B

Upwards, because reversing both quantities reverses the force twice

C

Zero, because the two reversals cancel each other out completely

D

Sideways, because the force turns through a right angle each time

Markscheme

4.2 Uses of magnetism Questions

  1. GCSE
  2. /Physics
  3. /4.2 Uses of magnetism

48 exam-style questions on OCR GCSE Physics 4.2 Uses of magnetism, covering 4.2.1 The motor effect, 4.2.2 Fleming's left-hand rule, 4.2.3 The force on a current-carrying conductor, 4.2.4 The electric motor, 4.2.5 Electromagnetic induction, 4.2.6 Alternators and dynamos, 4.2.7 How transformers work, 4.2.8 Transformer turns ratio, 4.2.9 Potential differences and turns in transformers, and 4.2.10 Microphones, loudspeakers and headphones. Each one has a worked solution and a mark scheme showing where the marks go.

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