a wave propagates in free space and its electric field is j75z (a) show that e satisfies the source-free wave equation. this prob lem asks you to show satisfaction of the wave equation, not the helmholtz equation. (b) what are the wave's phase velocity and frequency?

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?

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?

The energy produced as a result of this flow of electrons from atom to atom is called