Question

Manish wants to increase the speed of rotation of a DC motor, what measure/s should he take?

• A. By reducing the current in the coil.
• B. By increasing the turns of the coil.
• C. By increasing the current through the coil.
• D. By introducing a hard iron core.

Answer 1

Answer: (B), (C)

The correct options are
B By increasing the turns of the coil.
C By increasing the current through the coil.

The DC motor works on the principle of electromagnetism. To increase the speed of rotation of a motor, we need to increase the current flowing through the coil. Along with this, if the number of turns in the coils are more, it results in more change in magnetic field around a coil. This leads to greater force i.e. speed of rotation.