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The effective resistance between points ...

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

A

`2Rr//(R+r)`

B

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

C

2r

D

`2r + 4R`

Text Solution

Verified by Experts

The correct Answer is:
A

No current passes through A & B an B & C due balance Wheatstone bridge.
`1/R_(eq) =1/(4R) + 1/(2R) + 1/(4R)`
`=(2r+4R + 2r)/((4R)(2r)) rArr (4(R+r))/(8Rr) rArr (R + r)/(2Rr)`
`therefore R_(eq) =(2Rr)/(R +r)`
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