If the number of turns in the armature coil is doubled, the speed of rotation of the armature coil ___.

remains same

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first increases and then decreases

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decreases

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increases

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Solution

The correct option is D
increases

The speed of rotation of the armature coil depends upon the number of turns in the armature coil. If the speed of rotation of armature coil is $S$ and the number of turns in the coil is $n$ then, $S \propto n$ . Therefore, if the number of turns in the armature coil is doubled, the speed of rotation of the armature coil increases.

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