Question

Find the resistance of a hollow cylinder of inner radius a and outer radius b whose inner and outer cylindrical surfaces are connected by to a p.d ($\rho$ resistivity)

• A. $\frac{\rho l}{\pi ab}$
• B. $\frac{\rho }{2\pi r}ln\left(\frac{b}{a}\right)$
• C. $\frac{\rho }{\pi r}ln\left(\frac{b}{a}\right)$
• D. $\frac{2\rho }{\pi r}ln\left(\frac{b}{a}\right)$

Answer 1

The correct option is B $\frac{\rho }{2\pi r}ln\left(\frac{b}{a}\right)$