Assertion ( A ): Strain measurement using strain gauge invariably requires a dummy strain gauge.
Reason ( R ): The resistance of strain gauge depends on temperature.
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true R is false
D. A is false R is true
Share your understanding of this question with the correct explanation.