state what would happen to the direction of rotation of a motor if
(i) the current were reversed
(ii) the magnetic field was reversed
(iii) both current and magnetic field were reversed simultaneously
Answers
(i) Direction of rotation would be reversed.
(ii) Direction of rotation would remain unchanged.
The rotation of a motor in the given conditions,will change in the following ways -
• When the current is reversed the rotational direction of the motor is also reversed. And,this is also used to artificially change the direction of rotation of the motor.
• When the magnetic field is reversed the rotational direction of the motor is also reversed. This method is not used to artificially change the direction of rotation of motor because changing magnetic field inside a motor is a complex process.
• Now,when we change both the electric current and magnetic field simultaneously, the direction of the rotation of the motor stays the same. Because the reversion of the direction by each of the elements are cancelled by each other.