three uncharged insulating blocks, a, b, and c, are in contact, as shown. blocks a and c are attached to a vertical insulating surface. the gravitational force exerted by earth on block b causes block b to slide vertically down between blocks a and c. friction between block b and blocks a and c causes a transfer of charge. immediately after block b loses contact with blocks a and c, the magnitude of charge on block a is q and the magnitude of charge on block c is 2q. the sign of the charge on block a is negative, but it is unknown whether the charge on block c is positive or negative. which of the following describes the path of block b?
