Five identical cells are connected in parallel. Now, polarity of one of the cells is reversed. Percentage change in equivalent emf will be

Three identical cells are connected in parallel across AB. Net across AB is

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

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

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 identical cells of emf e and internal resistance r are to be connected in series. Suppose, if one of the cell is connected wrongly, the equivalent emf and effective internal resistance of the combination is:

Four identical cells of emf epsilon and internal resistance r are to be connected in series. Suppose, if one of the cell is connected wrongly, then the equivalent emf and effective internal resistance of the combination is

Four identical cells of emf epsilon and internal resistance r are to be connected in series. Suppose, if one of the cell is connected wrongly, then the equivalent emf and effective internal resistance of the combination is

Four identical cells of emf epsilon and internal resistance r are to be connected in series. Suppose, if one of the cell is connected wrongly, then the equivalent emf and effective internal resistance of the combination is