Question

86. If specific resistance of a potentiometer wire is
10-7 ohm m and current flow through it is 0.1 A,
cross-sectional area of wire is 10-6 m2 then
potential gradient will be
(1) 10-2 volt/m
(2) 10-4 volt/m
(3) 10-6 volt/m
(4) 10-8 volt/m
​

Answer 1

here we have calculated first restivity then potential per unit length.

Then the answer is (a)

Answer 2

Answer:

[1] is the right answer

And please FOLLOW me