A) 2R
B) 4R
C) 7R
D) 10R
Correct Answer: A
Solution :
[a] As the ring has no resistance, the three resistances of 3R each are in parallel. \[\Rightarrow \frac{1}{R'}=\frac{1}{3R}+\frac{1}{3R}+\frac{1}{3R}+=\frac{1}{R}\Rightarrow R'=R\] \[\therefore \]Between point A and B equivalent resistance \[=R+R=2R.\]
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