Physics · Oct / Nov 2024 · Paper 12 · Question 30

X is a piece of wire with length l, area a and resistance R. Wire Y is made from the same material and is connected to wire X to produce a component with a total resistance of \frac{R}{2}. What are the dimensions of Y and how is it connected to X?

1. Alength 2l, area 0.25a, in parallel
2. Blength 2l, area 0.25a, in series
3. Clength 4l, area 4a, in parallel
4. Dlength 4l, area 4a, in series

As printed in the paper