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A2 2 Fields, Capacitors, Particles and Astronomy

Quick questions on Magnetic fields and electromagnetic induction: the motor effect, Faraday's law and Lenz's law - CCEA A-Level Physics

4short 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 forces in a magnetic field?
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A charged particle moving across a uniform field follows a circular path, because the magnetic force is always perpendicular to its velocity and so does no work; the radius is r=mvBqr = \frac{mv}{Bq}.
What is q1?
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A wire of length 0.20 m0.20\ \text{m} carries a current of 3.0 A3.0\ \text{A} at right angles to a field of flux density 0.50 T0.50\ \text{T}. Find the force on it. [2 marks]
What is q2?
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State Lenz's law and the conservation principle it follows from. [2 marks]
What is q3?
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An electron moves at 4.0×106 m s−14.0 \times 10^{6}\ \text{m s}^{-1} perpendicular to a field of 0.25 T0.25\ \text{T}. Find the force on it. [2 marks]

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