Physics (AS & A Level) · Oct / Nov 2018 · Paper 11 · Question 18

Two wires X and Y are made from the same material. Wire Y has twice the diameter and experiences twice the tension of wire X. The wires obey Hooke's law and have the same original length. [diagram: wire X diameter d, tension T; wire Y diameter 2d, tension 2T] Wire X has extension e. What is the extension of wire Y?

1. Ae/4
2. Be/2
3. Ce
4. D2e

As printed in the paper