Two metal spheres are mounted on insulating stands.
Sphere P is initially uncharged and sphere Q is initially
positively charged. A metal rod, held by an insulating
handle, is placed in contact with P and Q as shown
in figure.
What are the charges on P and Q after the rod is
placed in contact with them?
| Charge on P | Charge on Q | |
|---|---|---|
| A | Positive | Positive |
| B | Positive | Uncharged |
| C | Uncharged | Positive |
| D | Uncharged | Uncharged |