On reversing the direction of the current in a wire, the magnetic field produced by it gets .....
When a body is placed on a table top, it exerts a force equal to its weight downward on the table top but does not move or fall.
i) Name the force exerted on the table top.
ii) What is the direction of the force?
How is work done by a force measured when the force:
i) is in the direction of displacement
State the energy changes in the following while in use:
i) Burning of a candle
ii) A steam engine