What is the relationship between power and bulb brightness (intensity)?

Explanation:

Power of an electrical appliance is given by :

P = VI

Here,

V is the voltage

I is the current

From the above formula for power, we find that power is directly proportional to the voltage of the circuit. If a single bulb is there in the circuit, increasing the voltage of the bulb will increase its power, which in turn increases its bulb brightness or intensity.

c) up is the direction the magnetic force is acting on the charge.

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.