Physics (AS & A Level) · Oct / Nov 2016 · Paper 11 · Question 22

A copper wire hangs vertically from a fixed point. A load is attached to the lower end of the wire producing an extension x. The wire obeys Hooke's law. Which single change gives an extension 2x?

1. AHalve the cross-sectional area of the wire.
2. BHalve the diameter of the wire.
3. CHalve the length of the wire.
4. DHalve the load on the wire.

As printed in the paper