State the condition which determine the direction of flow of heat.

State the rule to determine the direction of a force experienced by a conductor carrying straight current placed in a magnetic field which is perpendicular to it.

How is the direction of current related to the direction of flow of electron in a wire?

State one factaor which determines the intensity of light in the phton picture of light?

Two rods X and Y are of equal lengths. Each rod has its ends at temperature T_1 and T_2 . What is the condition that will ensure equal rate of flow of heat through the rods X and Y?

state the rule to determine the direction of a force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it, and

state the rule to determine the direction of a magnetic field produced around a straight conductor carrying current,