If a glass rod is rubbed with a dry cloth, what kind of charge would it be:
A) positive, due to extra protons
B)negative, due to protons lost
C) positive due to electrons lost
D) negative, due to extra electrons

If a small-diameter open glass tube is partially immersed in a vessel containing mercury, the surface of the mercury inside the tube will be a. lower than the mercury in the vessel, and shaped like the inside of a bowl. b. higher than the mercury in the vessel, and shaped like the inside of a bowl. c. lower than the mercury in the vessel, and shaped like the outside of an umbrella. d. higher than the mercury in the vessel, and shaped like the outside of an umbrella.