Find the equivalent resistance of the circuits shown in figure between the points a and b. Each resistor has a resistance r

Q. Find the equivalent resistance of the circuits shown in figure between the points a and b. Each resistor has a resistance r
Current Electricity

(a) r/2

(b) r/3

(c) r/4

(d) r/5

Ans: (a)

Sol: The upper circuit forms Wheatone bridge . At first find the equivalent resistance of upper circuit .
Then this equivalent resistance of the upper circuit is in parallel with resistor between a and b .

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