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State the underlying principle of a pote...

State the underlying principle of a potentiometer. Why is it necessary to (i) use a long wire, (ii) have uniform area of cross-section of the wire ?

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Principle of potentiometer: The potential drop across the length of a steady current carrying wire of uniform cross section is proporational to the length of the wire.
(i) We use a long wire to have a lower value of potential gradient (i.e., a lower .least count. or greater sensitivity of the potentiometer.
(ii) The ara of cross section has to be uniform to get a uniform Potential gradient. as per the principle of the potentiometer.
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  1. State the underlying principle of a potentiometer. Why is it necessary...

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