Charging Objects

When a glass rod is rubbed with a piece of silk, the glass rod acquires a positive charge and the silk acquires a negative charge. This process signifies that A) the glass rod was not rubbed very hard with the silk. B) the glass rod lost electrons to the piece of silk. C) the glass rod was rubbed very vigorously with the silk. D) the glass rod gained electrons from the piece of silk.

X and Y are two uncharged metal spheres on insulating stands, and are in contact with each other. A positively charged rod R is brought close to X as shown in Figure (a). Sphere Y is now moved away from X, as in Figure (b). What are the final charge states of X and Y?(a) X is positive and Y is neutral.(b) Both X and Y are neutral.(c) X is negative and Y is positive.(d) Both X and Y are negative.(e) X is neutral and Y is positive.

X and Y are two uncharged metal spheres on insulating stands, and are in contact with each other. A positively charged rod R is brought close to X as shown in the A.

A plastic rod is charged up by rubbing a wool cloth, and brought to an initially neutral metallic sphere. It  is allowed to touch the sphere for a few seconds, and then is separated from the sphere by a small distance. After the rod is separated, the rod A) feels no force due to the sphere. B) is attracted to the sphere. C) is repelled by the sphere.

A positively charged rod is brought close to an uncharged conducting ball. What happens? A. Nothing since the ball is uncharged.B. The ball becomes negatively charged.C. The ball becomes positively charged.D. The side of the ball near the rod becomes negatively charged.E. The side of the ball near the rod becomes positively charged.

A rod that has been charged to + 12.0 nC touches a metal sphere. Afterward, the rod's charge is + 7.0 nC . What kind of charged particle was transferred between the rod and the sphere? Proton or electron. In which direction was the charged particle transferred between rod and sphere? That is, did it move from the rod to the sphere or from the sphere to the rod?How many charged particles were transferred?