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
Explanation
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Discussions (12)
I feel the answer should be C because the main function of the split rings is to REVERSE THE DIRECTION OF CURRENT in the coil so that it can rotate continuously in one direction
So...
CURRENT DIRECTION => REVERSED
COIL DIRECTION => CONSTANT
And if the current direction is continuously reversed doesn't that make it alternating???
I may be wrong and I'm open to any corrections..
The correct answer is:
B. The current in the coil flows in the same direction
Explanation:
In a simple DC motor, split rings (commutator) are used to ensure that the current in the coil reverses direction every half-turn, which maintains continuous rotation in one direction.
The split rings act as a rotary switch, reversing the current in the coil just as it reaches the vertical position.
This ensures that the torque (rotational force) always acts in the same direction, keeping the motor spinning.
Why not the other options?
A: The direction of rotation is not reversed; it remains continuous due to the commutator.
C: The current in the coil is not alternating; it is unidirectional (DC) but reverses due to the commutator’s action.
D: The force direction reverses every half-cycle, but the torque direction remains the same (which is why the motor keeps spinning).
E: The contact is not cut off; the split rings maintain continuous contact while reversing current.
Thus, the primary effect of split rings is to ensure that the current in the coil flows in the same direction relative to the magnetic field, maintaining consistent rotation.
Final Answer: B
The explanation is contradicting the answer that was picked..
The explanation says it's used to reverse the direction of current for continuous rotation of the coil in the same direction and the option that was picked is saying to reverse the direction of rotation of coil
"For continuous rotation of coil in the SAME DIRECTION" and "REVERSE THE DIRECTION of rotation of coil" are they the same thing???
The correct answer is C
option A might be misleading without additional context. The key role of the split-ring commutator in a d.c. motor is to reverse the current direction in the coil each half-turn, which ensures that the coil continues to rotate in the same direction [ NOT REVERSED ].
Given this explanation, the correct option should focus on the current direction rather than directly on rotation. Thus, the most appropriate answer is: C. The current in the coil becomes alternating.
