1.

The effective resistance between points P and Q of the electrical circuit shown in the figure is                                                               [IIT-JEE (Screening) 2002]

A.            \[2Rr/(R+r)\]
B.            \[8R\,(R+r)/(3R+r)\]
C.            \[2r+4R\]
D.            \[5R/2\,\,+\,2r\]
Answer» B.            \[8R\,(R+r)/(3R+r)\]


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