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Two cells of same emf E but internal res...


Two cells of same emf E but internal resistance `r_(1) and r_(2)` are connected in series to an external resistor R(figure). What should be the value of R so that the potential difference across the terminals of the first cell becomes zero?

A

`sqrt(r_1 r_2)`

B

`r_1+r_2`

C

`r_1-r_2`

D

`(r_1+r_2)/2`

Text Solution

Verified by Experts

`I=(2E)/(R+r_1+r_2)`
Acc to question
`E-Ir_1=0`
`E-(2Er_1)/(R+r_1+r_2)=0 implies R=r_1-r_2`
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