Assertion :Both DC and AC can be measured by a hot wire instrument. Reason: The hot wire instrument is based on the principle of magnetic effect of current.
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 hotwire instrument is based on the heat I2rmsRt and/or power I2rmsR producing property of current. Hence it can measure both ac and dc current as both produce heat when passed through a conductor. A hotwire instrument is not based on the principle of the magnetic effect of current.
So the assertion is correct bur reason is incorrect