In a arrangement, 3n cells of emf `epsilon` and internal resistance r are connected in series. Out of 3n cells polarity of n cells is reversed. Current in the circuit is

Four cells, each of emf E and internal resistance r, are connected in series across an external resistance reverse. Then, the current in the external circuit is

A cell of emf epsilon and internal resistance r is charged by a current I, then

A cell of emf epsilon and internal resistance r is charged by a current I, then

n electric cells of emf e and internal resistance r each are connected in series.What is the emf of this combination.

Twenty cells each of emf E and internal resistance r are connected in series to form a loop . If polarity of one of the cell is reserved, then terminal potential across this cell is

Ten cells each of emf 1 V and internal resistance 1Omega are connected inseries. In this arrangement, polarity of two cells is reversed and the system is connected to an external resistance of 2Omega . Find the current in the circuit.

Ten cells each of emf 1 V and internal resistance 1Omega are connected inseries. In this arrangement, polarity of two cells is reversed and the system is connected to an external resistance of 2Omega . Find the current in the circuit.

n-identical cells each of emf E and internal resistance r are connected in series. Find the expression for current in the circuit given below