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4.2 Uses of magnetism

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Question 7
H

A wire of length 0.40 m is at right angles to a magnetic field of magnetic flux density 0.15 T0.15\ \text{T}0.15 T. The force on the wire is 0.18 N.

What is the current in the wire?

[1]
A

3.0 A3.0\ \text{A}3.0 A

B

1.2 A1.2\ \text{A}1.2 A

C

0.33 A0.33\ \text{A}0.33 A

D

0.011 A0.011\ \text{A}0.011 A

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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