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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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Answer» Solution :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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