Assertion :A step-up transformer changes a low voltage into a high voltage Reason: This violate the law of conservation of energy

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
When voltage is stepped up by a factor K then simultaneously current will decrease by factor K, so the product of voltage & current will remains constant .
Also when voltage is stepped down by a factor K then simultaneously current will increase by factor K, so the product of voltage & current will remains constant .
So there is no violation of principle of conservation of energy.
Hence the assertion is incorrect.

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