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(a) State the working principle of a potentiometer with help of the circuit diagram , explain how the internal resistance of a cell is determined. How are the following affected in the potentiometer circuit when(i) the internal resistance of the driver cell increases and (ii) the series resistor connected to the driver cell is reduced ? Justify your answer. 5 |
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Answer» Solution :(b) If theinternal resistance of driver cell is increased then I GIVEN in the POTENTIOMETER circuit GETS reduced. Hence, balancing length of thepotentiometer WIRE increases. When theseries resistance to the driver cell is reduced then CURRENT I in thepotentiometer circuit given by thedriver cell increases. Therefore potentialgradient in the potentiometer wire increases, hence, balancing length decreases. |
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