A cell of emf E and internal resistance ...

A cell of emf E and internal resistance r supplies currents for the same time t through external resistances `R_(1) = 100 Omega and R_(2) = 40 Omega` separately. If the heat developed in both cases is the same, then the internal resistance of the cell is

`28.6Omega`

`70Omega`

`63.3Omega`

`140Omega`

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