What is the role of the two conducting stationary brushes in a simple electric motor?

What does the divergence of magnetic field lines near the ends of a current carrying straight solenoid indicate?

Name four appliances wherein an electric motor, a rotating device that converts electrical energy to mechanical energy, is used as an important component. In what respect motors are different from generators?

What is the difference between a direct current and an alternating current? How many times does AC used in India change direction in one second?

What is the role of fuse, used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?