A-Level UK (AQA, Edexcel, OCR) · Physics

Magnetic fields and induction

6 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 6 questions

  1. A 0.10 m wire carrying 3.0 A is at right angles to a uniform field of 0.20 T. What is the force on the wire?
  2. A proton (m = 1.67 x 10^-27 kg, q = 1.60 x 10^-19 C) moves at 2.0 x 10^6 m/s perpendicular to a 0.50 T field. What is the radius of its circular path?
  3. A coil of 200 turns has its magnetic flux fall from 4.0 x 10^-3 Wb to zero in 0.020 s. What is the average induced emf?
  4. Which statement of Lenz's law is correct?
  5. An ideal transformer has 1000 turns on its primary and 50 turns on its secondary. The primary is connected to 230 V a.c. What is the secondary voltage?
  6. A coil of 100 turns and area 0.020 m2 is perpendicular to a uniform field of 0.30 T. What is the flux linkage?

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