Assertion ( A ): In hot wire instrument the material of hot wire in generally platinum iridium.
Reason ( R ): A hot wire ammeter is suitable for ac only
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.