engineering recuitment AAI ATC Junior Executive 2025 Mock Test Series Physics Current, Resistance and Electricity Work, Energy, and EMF
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
1
4E and 4r
2
4 and 2r
3
2E and 4r
4
2E and 2r