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" Explain the principle of potentiometer...

" Explain the principle of potentiometer."

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Explain the principle of a potentiometer. How will you compare the e.m.f. of two primary cells by using potentiometer? Explain with proper circuit diagram.

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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