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4.1 Magnets and magnetic fields

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Question 24
H

A plotting compass is 2 cm from a long straight wire that carries a current.

Which pair of changes must make the magnetic field at the plotting compass stronger?

[1]
A

Halve the current, and move the compass to 1 cm1\ \text{cm}1 cm from the wire

B

Double the current, and move the compass to 6 cm6\ \text{cm}6 cm from the wire

C

Double the current, and move the compass to 1 cm1\ \text{cm}1 cm from the wire

D

Reverse the current, and keep the compass at 2 cm2\ \text{cm}2 cm from the wire

Markscheme

4.1 Magnets and magnetic fields Questions

  1. GCSE
  2. /Physics
  3. /4.1 Magnets and magnetic fields

44 exam-style questions on OCR GCSE Physics 4.1 Magnets and magnetic fields, covering 4.1.1 Magnetic poles, attraction and repulsion, 4.1.2 Permanent and induced magnets, 4.1.3 The magnetic field of a magnet, 4.1.4 Compasses and the Earth's magnetic field, 4.1.5 The magnetic field around a current-carrying wire, 4.1.6 Field strength, current and distance, and 4.1.7 Solenoids and electromagnets. Each one has a worked solution and a mark scheme showing where the marks go.

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