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A cell of emf ' epsi ' and internal resistance 'r' is connected across a variable resistor 'R'. Plot agraph showing the variation of terminal potential 'V' with resistance R. Predict from the graph the condition under which 'V' becomes equal to ' epsi ' |
Answer» Solution : The terminal potential difference `V = IR = (epsi)/((R+r)) .R (epsi)/((1+r/R))` Thus as R increases, V ALSO increases. Graph is shown in adjoining FIG. From the graph it is CLEAR that V becomes equal to `epsi`, when R becomes `OO` |
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