Physics · May / June 2022 · Paper 12 · Question 31

Two metal spheres are mounted on insulating stands. Sphere X is initially uncharged and sphere Y is initially positively charged. A metal rod, held by an insulating handle, is placed in contact with X and Y as shown. What are the charges on X and on Y after the rod is placed in contact with them?

1. Acharge on X: positive; charge on Y: positive
2. Bcharge on X: positive; charge on Y: uncharged
3. Ccharge on X: uncharged; charge on Y: positive
4. Dcharge on X: uncharged; charge on Y: uncharged

As printed in the paper