| Assertion (A): Meter bridge wire is generally made of Constantan. |
| Reason (R): Constantan has a very low temperature coefficient of resistance. |
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: A
Solution :
| Option [a] is correct |
| Explanation: Meter bridge wire is generally made of Constantan. The assertion is true. |
| Temperature coefficient of resistance of Constantan is very low. So, its resistance variation is negligible even after long use. This is the requirement of an ideal meter bridge. So the reason is true and properly explains the assertion. |
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