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State the principle of potentiometer....

State the principle of potentiometer.

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The basic principle of potentiometer is the when a constant current flows throught a wire of unifrom cross - sectional area na composition , the potential drop across and length of the wire is drectly proportional to that length.
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A. Potentiometer measures the potential difference more accurately than a voltmeter, because the potentiometer a. does not draw current from external circuit. b. has a wire of high resistance. c. draws a heavy current from external circuit. d. has a wire of low resistance. B. With the help of a diagram explain the principle of a potentiometer.

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