Why does a current-carrying solenoid when suspended freely rests along a particular direction ?
State two ways by which the strength of an electromagnet can be increased.
State three factors on which the magnitude of the force on a current-carrying conductor placed in a magnetic field depends. Can this force be zero for some position of the conductor ?
A DC motor is rotating in clockwise direction. How can the direction of rotation be reversed ?
State two ways by which the speed of rotation of an electric motor can be increased.