Physics · Oct / Nov 2018 · Paper 11 · Question 33

A wire is placed in the magnetic field between the poles of a magnet, as shown. [diagram: N pole above, S pole below, wire between them] When there is a current in the wire, it experiences a force. Which change increases the size of this force?

1. Areverse both the direction of the current and the poles of the magnet
2. Breverse just the direction of the current
3. Cuse a stronger magnet
4. Duse a thicker wire with the same current

As printed in the paper