Question

Two cells with the same emf and different internal resistances and are connected in series to an external resistance . The value of so that the potential difference across the first cell be zero, is

A

B

C

D

Medium
Updated on : 2022-09-05
Solution
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Correct option is C)

The two cells have potential each and respective internal resistance and .
Let the current flowing in the circuit be .

Using Kirchhoff's voltage law:                    
 

Potential across first cell,

For , we get: 

               

                 

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