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  4. A cell of emf E and internal resistance r supplies currents for the same time t through external resistance R1=100 Ω and R2=40 Ω separately. If the heat developed in both cases is the same, then the internal resistance of the cell is given by

Q. A cell of emf and internal resistance supplies currents for the same time through external resistance and separately. If the heat developed in both cases is the same, then the internal resistance of the cell is given by

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Solution:

Current drawn from the cell in resistance will be

Therefore, the heat produced in i.e.

Heat produced in
As per question
or
On solving we get;

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