Physics

Problem

Two long coaxial and conducting cylinders of radius

a

and

b

are separated by a material of conductivity

\sigma

and a constant potential difference

V

is maintained between them, by a battery. Then the current per unit length of the cylinder flowing from one cylinder the other is: (a)

\frac{3\pi\sigma}{4\ln(b/a)}V

(b)

\frac{\pi\sigma}{\ln(b/a)}V

(c)

\frac{2\pi\sigma}{\ln(b/a)}V

(d) None of these (a)

\frac{3\pi\sigma}{4\ln(b/a)}V

(b)

\frac{\pi\sigma}{\ln(b/a)}V

(c)

\frac{2\pi\sigma}{\ln(b/a)}V

(d) None of these