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Two cells of emf 3V and 5V and internal ...

Two cells of emf 3V and 5V and internal resistance `r_(1)` and `r_(2)` respectively are in series with an external resistance R. if the p.d. across 1 st cell is zero, then R is

A

`(5r_(1)-3r_(2))/(3)`

B

`(2r_(1)-3r_(2))/(4)`

C

`(3r_(1)-5r_(2))/(3)`

D

`(4r_(1)-5r_(2))/(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
`V=E-ir`
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