Question

If specific resistance of a potentiometer wire is 10−7Ωm and current flow through it is 0.1 A, cross-sectional area of wire is 10−6m2 then potential gradient will be :-

Answer 1

Final Answer : 0.1 V/m

Steps:

1) Potential Gradient,x : Potential drop per unit length.

Where V is Potential Difference

L. : Length of wire

A : Area of Cross section of wire.

I, Current = 0.2A

2) We know that,

Resistance = pl/A

p -> specific resistance

l -> length of wire.

A -> Area of cross section.

Use it in equation (1),

Therefore, Potential Gradient is 0.1 V/m.

Answer 2

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