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A cell of E.M.F. E and internal resistan...

A cell of E.M.F. E and internal resistance r supplies currents for the same time t through external] resistances `R_1`and `R_2` respectively. If the heat produced in both cases is the same then the internal resistance is given by

A

`1/r=1/R_1+1/R_2`

B

`r=(R_1+R_2)/2`

C

`r=sqrt(R_1R_2)`

D

`r=R_1+R_2`

Text Solution

Verified by Experts

The correct Answer is:
C
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