WAEC - Physics (1988 - No. 41)
What is the effect of using split-rings in a simple d.c motor?
The direction of rotation of the coil is reversed
The current in the coil flows in the same direction
The current in the coil becomes alternating
The direction of the force on the coil is reversed
The contact with the voltage is cut-off
Paliwanag
Split ring is used for reversing the direction of current in the coil. For the continuous rotation of the coil in the same direction, the current in the coil must be reversed.