state the working principle of a potentiometer using the necessary circuit diagram explain briefly
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principle of potentiometer:-
"it works on the principle that the potential difference across any part of a uniform wire is directly proportional to the length, when a constant current flows through the wire"....
V=Ipl
v is directly proportional to l...
let 'v' be the potential difference across the wire of length
R is resistance
A be uniform area of cross-section
I be the current passing through the wire then according to the ohms law,
v=IR
But, R=pl/A
where p=resistivity of the wire
v=Ipl/A
But, IP/A=k
v=Kl
where k is the constant.....
Explanation:
Hope it helps you......
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