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Magnetic fields and the motor effect

Magnetic fields and the motor effect

Motor effect diagram showing N and S poles, a wire with current out of the page, upward force, and Fleming's left-hand rule labels

A magnetic field is the region where a magnet, magnetic material, or moving charge can experience a force. Outside a bar magnet, field lines go from north to south. A conductor such as copper lets charge flow easily, so it is commonly used for circuit wires.

4.2 Uses of magnetism Lesson

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

Step-by-step lessons 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 builds up to exam-style questions. Paper 2 and Paper 4 include synoptic questions that draw on Topics P1–P4, so revisit earlier topics before final exams rather than treating each paper as self-contained.

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