Assertion :The back emf in a dc motor is maximum when the motor has just been switched on. Reason: When motor is switched on it has maximum speed.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Back emf is actually the induced emf produced in motor. When motor is just switched on. the magnitude of back emf is quite small eine to the low peed of the motor. But the magnitude of back emf is very large at break (when electric supply fails suddenly, while the motor is running).

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