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The direction of rotation of a DC motor can be determined by:
Question

The direction of rotation of a DC motor can be determined by:

A.

Ampere’s law

B.

Fleming's left hand rule

C.

Fleming's right hand rule

D.

Lenz's law

Correct option is B



The image explains Fleming's Left-Hand Rule, which is used to determine the direction of the force, magnetic field, and current in a conductor when subjected to electromagnetic forces. According to the rule:
· Thumb: Points in the direction of the magnetic thrust or force (motion).
· First (Pointer) Finger: Points in the direction of the magnetic field.
· Second (Middle) Finger: Points in the direction of the induced current.
In this rule, the three fingers (thumb, pointer, and middle) are arranged at right angles to each other. This rule is primarily applied in electric motors to predict the direction of motion resulting from electromagnetic forces.

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