Question

In the following (figure), the equivalent resistance between the points A and H will be [cos 72° = 0.31] (wire has uniform resistance)

(1)  1.944 r 

(2)  0.973 r 

(3)  0.486 r 

(4)  0.243 r

Answer 1

Correct option  (2) 0.973 

Explanation:

Resistance of CD, DJ, JH, HF,FC = r/2