To determine the direction of the magnetic field produced by electric current, ______ rule is used. 53
right hand thumb
When a copper wire with a resistive coating is wound in a chain of loops (like a spring), it is called ______. 54
a solenoid
A device changing electrical energy into mechanical energy is known as ______. 55
electric motor
In India, the frequency of AC is ______. 59
50 Hz