A radio is operated by eight cells each of e.m.f. 2.0V connected in series. If two of the cells are wrongly connected, the net e.m.f. of the radio is

Answer Details

When the cells are connected in series, their voltages add up to give the total voltage of the battery. In this case, eight cells each of 2.0V connected in series will give a total voltage of 16V. If two cells are wrongly connected, the direction of current in the circuit will change, and the voltage of those two cells will be subtracted instead of being added. Therefore, the net voltage of the battery will be 16V - (2V + 2V) = 12V. Hence, the correct answer is 12V.