| Assertion (A): Both ac and dc can be measured by hot wire instrument. |
| Reason (R): Hot wire instrument is based on the principal of magnetic effect of current |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: C
Solution :
| Option [c] is correct |
| Explanation: In both ac and dc, heat generated is proportional to the square of current. Polarity change of ac is immaterial in the case of heat generation. Hence they can be measured by hot wire instrument. Hence, the assertion is true. |
| Hot wire instruments are based on the principle of heating effect of current. Hence the reason is false. |
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