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QAIPM-2001-Ph-2947: NEET 2001 Physics - Class 12 AIPM-2001-Ph-2947 Solution: If specific resistance of a potentiometer wire is \(10^{-7} \)…

If specific resistance of a potentiometer wire is 10−7Ω10^{-7}\Omega m and current flow through it is 0.1 amp., cross-sectional area of wire is 10−6 m210^{-6}\ \text{m}^2 then potential gradient will be

Multiple Choice Options

  • A 10−210^{-2} volt/m
  • B 10−410^{-4} volt/m
  • C 10−610^{-6} volt/m
  • D 10−810^{-8} volt/m.

Step-by-Step Verified Solution

Potential gradient = Potential fall per unit length. In this case resistance of unit length. R = _ l A = 10 _ 7 _ 1 10 _ 6 = 10 _ 1 � Potential fall across R is V = I.R = 0.1 _ 10 -1 = 0.01volt/m. = 10 _ 2 volt/m

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