If a resistance is halved in value and the potential difference across it is tripled, then the ratio of the new current to the old one is
-
A.
1 : 6 -
B.
1 : 3 -
C.
2 : 1 -
D.
6 : 1
Correct Answer: Option D
Explanation
(frac{V_1}{V_2}) = (frac{I_1R_1}{I_2R_2})
(frac{I_1}{I_2})V2 = 3V1 and R1 = 2R2
(frac{V_1}{3V_1}) = (frac{I_1 times 2R_2}{I_2times R_2})
(frac{I_1}{I_2}) = (frac{6}{1})