An oil drop with a mass of 7.20 x 10^-116 kg is moving up at a constant speed of 2.50 m/s between two horizontal parallel plates. If the electric field strength between these plates is 2.20 x 10^4V/m, what is the magnitude of the charge on the oil drop?

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?