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The effective resistance between points P and Q of the electrical circuit shown in the figure is

Option: 1

2 R r /(R+r)


Option: 2

8 R(R+r) /(3 R+r)


Option: 3

2 r+4 R


Option: 4

5 R / 2+2 r


Answers (1)

best_answer

From symmetry the equivalent circuit reduces to as shown in the figure.

R_{e q}=\frac{2 R r}{(R+r)}\\

\therefore \quad (a)

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shivangi.bhatnagar

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