Assertion ( A ): The gall tinsley potentiometer is a coordinate potentiometer and has two exactly similar potentiometers.
Reason ( R ): An ac potentiometer may measure the unknown voltage in polar form or rectangular coordinate form.
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.