Physics (AS & A Level) · May / June 2016 · Paper 12 · Question 4

The diagram shows a cathode-ray oscilloscope (c.r.o.) being used to measure the rate of rotation of a flywheel. The flywheel has a small magnet M mounted on it. Each time the magnet passes the coil, a voltage pulse is generated, which is passed to the c.r.o. The display of the c.r.o. is 10 cm wide. The flywheel is rotating at 3000 revolutions per minute. Which time-base setting will display clearly separate pulses on the screen?

1. A1 s cm⁻¹
2. B10 ms cm⁻¹
3. C100 µs cm⁻¹
4. D1 µs cm⁻¹

As printed in the paper