In the figure given below, a coil is placed between two permanent magnets and rotated with the help of an axle on which two rings R1 and R2 are internally attached. B1 and B2 represent metallic brushes. G represents a galvanometer.

As the coil starts to rotate, the current flows through ABCD as shown. The coil starts rotation in the?

Clockwise direction

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Anti-clockwise direction

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Either Clockwise or anti-clockwise

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Can't be said

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Solution

The correct option is A
Clockwise direction

Using Fleming's right-hand rule, point your index finger of your right hand towards the direction of the magnetic field, i.e. from north to south. Point your middle finger towards the direction of the current. You can now see that the thumb points upwards which should tell that the coil rotates in the clockwise direction.

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