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4.1 Magnets and magnetic fields

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Question 7
H

A boat has a magnetic compass mounted close to the steering wheel.

The body of the boat is made of steel. An electric cable runs close to the compass. When the navigation lights are switched on, there is a direct current in the cable.

a.

Explain why the steel body of the boat can make the compass point in the wrong direction.

[2]
b.

When the navigation lights are switched on, the direction shown by the compass changes.

Explain why.

[2]
c.

Suggest two changes that would reduce the effect of the cable on the compass.

[2]
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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