Assertion :Transformer is useful for stepping up or stepping down voltages. Reason: Transformer is a device used in D.C. circuits.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is C Assertion is correct but Reason is incorrect Transformer is used to convert high-voltage , low current into low voltage and high current power.And this is called step up and step down for a transformer .
And transformer is always used with AC circuits otherwise it will burn.