Correct option is C
Correct answer is (c) Only (a)
Statement (a) is correct: An electric motor uses split rings. In a DC motor, split rings (also known as commutators) are used to reverse the direction of current in the coil, ensuring that the motor continues to rotate in the same direction. The split ring commutator serves as a mechanical switch that alternates the direction of current flow, which is crucial for continuous rotation.
Statement (b) is incorrect: The direction of the force on the motor's coil is found using Fleming's left-hand rule, not the right-hand rule. Fleming's left-hand rule is used to determine the direction of the force (or motion) in a motor when the direction of the current and magnetic field are known. On the other hand, Fleming's right-hand rule is used for generators to determine the direction of induced current when a conductor moves through a magnetic field.
Fleming’s Left-hand Rule: It states that if the left hand is held with the thumb, forefinger, and middle finger perpendicular to each other, then:
Information Booster:
- Thumbforce The represents the direction of the (motion of the coil),
- Forefingermagnetic field :The represents the direction of the (from north to south),
- Middle fingercurrent The represents the direction of the (flow of charge in the conductor).
- Split Rings: Split rings in an electric motor ensure the current flowing through the coil is periodically reversed, which enables the motor to rotate continuously. Without the commutator, the coil would stop rotating after half a revolution due to the current's direction becoming opposed to the motion.
- Fleming’s Left-hand Rule: This rule is essential for understanding the operation of electric motors, as it allows us to predict the motion based on the current and magnetic field.
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