Physics · May / June 2021 · Paper 12 · Question 37

A trolley carrying a strong magnet rolls down a ramp at constant speed. It passes through a coil as shown. An electromotive force (e.m.f.) is induced in the coil. A graph of the e.m.f. against time is plotted. The experiment is repeated with different coils and with a steeper ramp. The trolley moves at a greater constant speed on the steeper ramp. Which graph is produced using the coil with the least number of turns and the steepest ramp? All graphs are drawn to the same scale.

1. Agraph A
2. Bgraph B
3. Cgraph C
4. Dgraph D

As printed in the paper