Acapacitor stores energy u1 when it holds charge q .the same capacitor stores energy u2 when it holds charge 16 q what is the ratio between u2/u1

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?

Convection currents are caused by differences in what two things?

Which radioisotope is used in dating geological formations?