Physics (AS & A Level) · May / June 2016 · Paper 11 · Question 4

When performing an experiment, a student should minimise the uncertainty of any measurement. In which case is the student reducing the systematic error in a measurement?

1. Aadjusting a voltmeter needle pointer to the zero position before using it to measure a potential difference
2. Bmeasuring the diameter of a wire at several points and orientations
3. Cmeasuring the mass of 100 paperclips to determine the mass of one paperclip
4. Dtiming 20 oscillations of a mass on a spring to determine the period of one oscillation

As printed in the paper