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A cell to emf. E and internal resistance...

A cell to emf. E and internal resistance r supplies currents for the same time t through external resistance`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_(1)R_(2))`

D

`r=R_(1)+R_(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
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