Q. All the edges of a block with parallel faces are unequal. Its tangent edge is twice its shortest edge. The ratio of the maximum to minimum resistance between parallel faces is
A) 8
B) 4
C) 2
D) None of these
Explanation
(b) Let the length of various edges in increase order be $l,x,2l$ respectively
$R_{\max} = \frac{\rho 2l}{xl} = \frac{2\rho}{x};R_{\min} = \frac{\rho l}{2lx} = \frac{\rho}{2x}$
$\therefore\ \ \frac{R_{\max}}{R_{\min}} = 4$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.