In order to increase the speed of a DC motor, the following methods cannot achieve the purpose:
A. Increase the current in the coil
B. Increase the number of turns of the coil
C. Swap the magnetic poles of the magnet
D. Enhance the original magnetic field
Answer:C
In order to increase the speed of a DC motor, the following methods cannot achieve the purpose:
A. Increase the current in the coil B. Increase the number of turns of the coil C. Swap the magnetic poles of the magnet D. Enhance the original magnetic field