A satellite orbits the earth at a height of 250,000 m above the surface of the earth. Determine the speed of the satellite.

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

Give an example in which the electrical energy changes to light energy

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?