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Fields and their consequences
Quick questions on Magnetic fields and induction: F = BIL, flux linkage and Faraday's law - Edexcel A-Level Physics
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is force on a current-carrying conductor?Show answer
The force is maximum when the current is perpendicular to the field () and zero when parallel. Fleming's left-hand rule gives the direction: thumb for force (motion), first finger for field, second finger for current. This motor effect is the basis of motors, loudspeakers and moving-coil meters.
What is force on a moving charge?Show answer
A moving charge is a current, so it too feels a force in a field:
What is q1?Show answer
State the unit of magnetic flux density and one equivalent definition. [1 mark]
What is q2?Show answer
A coil of turns and area m squared has the field through it changed from T to zero in s. Find the average induced EMF. [3 marks]
What is q3?Show answer
Explain how Lenz's law is a statement of conservation of energy. [2 marks]
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