The circuit shown has resistors of equal resistance R. Find the equivalent resistance between A and B, when the key is closed.

Q. The circuit shown has resistors of equal resistance R. Find the equivalent resistance between A and B, when the key is closed.

Numerical

(a)   11R/12

(b) 13R/12

(c)   R/5

(d) 15R/12

Ans: (c)

Sol: Here , the unnamed resistor are redundant due same potential of both the terminals,

Remaining Five resistors are in parallel.

RAB = R/5

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