Current Electricity Charging Discharging Of Capacitors Question 296
Question: A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10?7 ohm?meter and the current passing through it is 0.1 ampere; cross-section of the wire is 10?6 m2. The potential gradient along the potentiometer wire is
[KCET 2003]
Options:
A) $ {{10}^{-4}} $ V/m
B) $ {{10}^{-6}} $ V/m
C) $ {{10}^{-2}} $ V/m
D) $ {{10}^{-8}} $ V/m
Show Answer
Answer:
Correct Answer: C
Solution:
Potential gradient (x) $ =\frac{i\rho }{A} $
$ =\frac{0.1\times {{10}^{-7}}}{{{10}^{-6}}}={{10}^{-2}},V/m $
BETA
