A plastic rod and a cloth are both initially uncharged. The rod is then rubbed against the cloth, and the cloth becomes positively charged. What sign does the charge on the plastic rod have, and why does the rod become charged?
- Anegative; electrons move from the cloth to the rod
- Bnegative; protons move from the rod to the cloth
- Cpositive; electrons move from the rod to the cloth
- Dpositive; protons move from the cloth to the rod