State principle of potentiometre and define its sensitivity.
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THE PRINCIPLE OF POTENTIOMETER :
THE POTENTIAL DIFFERENCE ACROSS ANY LENGTH OF A WIRE OF UNIFORM CROSS SECTION AND UNIFORM COMPOSITION IS PROPORTIONAL TO ITS LENGTH WHEN A CONSTANT CURRENT FLOWS THROUGH IT.
SENSITIVITY :
SENSITIVITY OF POTENTIOMETER DEPENDS ON THE VALUE OF POTENTIAL GRADIENT 'K' .
SENSITIVITY INCREASES WITH INCREASE OF LENGTH OF POTENTIOMETER WIRE.
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