Final answer:
To calculate the net emf, subtract the emf of the two incorrectly connected cells from the total possible emf. The correct net emf should be 12.0V, but none of the provided options match this value.
Step-by-step explanation:
The question is specifically relating to the concepts of electromotive force (emf) and electrical circuits. In this case, a radio is operated by eight cells connected in series, with each cell having an emf of 2.0V. If two of these cells are connected incorrectly (in reverse), we need to calculate the net emf of the radio.
To solve this, initially, all eight cells would contribute 2.0V each when connected in series, resulting in a total emf of 8 x 2.0V = 16.0V. When two cells are connected in reverse, their emf will subtract from the total rather than add to it. Therefore, the net emf would be:
16.0V (original total) - 2 x 2.0V (for the two reversed cells) = 12.0V.
However, the possible answers provided in the question do not list 12.0V as an option, and there might be a mistake in the question's answer choices. Based on correct calculations, none of the options A) 14.5V, B) 15.0V, C) 13.5V, or D) 14.0V is correct. The net emf should be 12.0V.