A cell of emf `epsilon` and internal resistance r gives a current of 0.5 A with an external
Channel: Doubtnut
Date: 2020-08-23

A cell of emf `epsilon` and internal resistance r gives a current of 0.5 A with an external resistance of `12 Omega` and a current of 0.25 A with an external resistance of `25 Omega`. Calculate (a) internal resistance of the cell and (b) emf of the cell.