$(a)$ Name two electrical appliances of daily use in which an electric motor is used.
$(b)$ Name and state the principle on which an electric motor works.

(N/A) Electric motors are commonly used in appliances such as electric fans,washing machines,and mixers.
$(b)$ An electric motor works on the principle that a current-carrying conductor placed in a magnetic field experiences a mechanical force.
Fleming's Left-Hand Rule: If we stretch the thumb,forefinger,and middle finger of our left hand such that they are mutually perpendicular to each other,then the forefinger points in the direction of the magnetic field,the middle finger points in the direction of the current,and the thumb gives the direction of the force acting on the conductor.