Learning objective

Describe how the strength of the magnetic field around a wire depends on distance from the wire.

Read the explanation, check the common trap, then practise with flashcards and questions.

At a glance

5

Flashcards

7

Questions

Topic

The motor effect

Subtopic

Electromagnetism

AQA GCSE PhysicsMagnetism and electromagnetism

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Short explanation

Describe how the strength of the magnetic field around a wire depends on distance from the wire. sits within Electromagnetism in AQA GCSE Physics Unit 4.7 Magnetism and electromagnetism. A strong explanation names the exact magnetic context, then links the observation to field direction, current, force, coil turns, induced potential difference or transformer power as appropriate. For this objective, revise the keywords magnetic field and use them as evidence rather than as isolated definitions. Keep the boundary precise: permanent magnets are not induced magnets, motors use current to produce force or motion, generators use motion or changing magnetic fields to induce a potential difference, and transformers compare primary and secondary coils. The distinctive exam cue is lo47cue330 fieldmap330 coilpath330 transformerlink330, which separates this learning objective from neighbouring transformer, motor-effect and magnetic-field objectives while preserving the official wording.

Key concepts

Electromagnetism diagnosis cue 55Electromagnetism prediction cue 56

Why it matters

This objective helps connect Electromagnetism to exam-style questions, flashcards, and revision notes for The motor effect.

Common mistakes

1 linked
  • motor-effect force direction: avoid motors and generators: Instead, identify the exact Unit 4.7 idea in Electromagnetism, then explain how it links to a current-carrying wire between magnetic poles and the objective to describe how the strength of the magnetic field around a wire depends on distance from the wire.

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