CAPE Physics Unit 2 · 2007 · Paper 1 · Question Q15

The diagram shows a piece of wire 0.5\text{ m} long moving with a speed of 3.0\text{ m s}^{-1} perpendicular to a magnetic field of field strength 1.5\text{ mT}. What is the e.m.f. induced across the ends of the wire?

1. (A)4.5 \times 10^{-3}\text{ V}
2. (B)2.25 \times 10^{-3}\text{ V}
3. (C)7.5 \times 10^{-3}\text{ V}
4. (D)2.25 \times 10^{3}\text{ V}

This question uses a figure or table from the paper — you'll see it when you practise.