Question

What happens when a current is passed in the coil ?

• A. The coil will experience a torque due to which it will translate.
• B. The coil will experience a force due to which it will rotate.
• C. The coil will experience a force due to which it will translate.
• D. The coil will experience a torque due to which it will rotate.

Answer 1

The correct option is D The coil will experience a torque due to which it will rotate.

Permanent magnet (PM) direct current converts electrical energy into mechanical energy through the interaction of two magnetic fields. One field is produced by a permanent magnet assembly; the other field is produced by an electrical current flowing in the coil through
the commutator. These two fields result in a torque which tends to rotate the coil ABCD. As the coil turns, the current in the winding are commutated to produce a continuous torque output.
Thus, when current flows through a rectangular coil ABCD placed in between the poles of a permanent magnet, the magnetic force produces a torque which rotates the coil.