Charging by Contact- Page 471# 1, 2, 5 answers

1. (a) A cat rubbing against a balloon results in charging by friction.

(b) The cat’s fur and the balloon have opposite charges. The cat’s fur becomes positively charged and the balloon becomes negatively charged when the two come in contact.

2. (a) If you bring a negatively charged metal pie plate in contact with a neutral glass rod, electrons will move to the neutral glass rod.

(b) The glass rod will be negatively charged.

5. (a) When the rod touches the sphere, electrons will move from the sphere to the rod.

(b) The sphere will acquire a positive charge.

Mrs. Giovannone