PHYSICS

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

  • A. 8V
  • B. 10V
  • C. 12V ✓
  • D. 16V

 

When eight cells each with an electromotive force (e.m.f.) of 2.0V are connected in series to operate a radio, the total e.m.f. of the system is calculated by adding up the individual e.m.f. values of each cell. Therefore, in this case, the total e.m.f. of the radio would be 8 cells x 2.0V = 16V.

If two of the cells are wrongly connected, it means that their polarities are reversed when compared to the correct connection. This reversal would result in a decrease in the total e.m.f. of the system. When two cells are connected incorrectly, they effectively subtract their e.m.f. values from the total instead of adding to it.

Therefore, when two cells are wrongly connected in this scenario, the net e.m.f. of the radio would be 8 cells x 2.0V – 2.0V – 2.0V = 12V.

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