Q.
Two plates $R$ and $S$ are in the form of a square and have the same thickness. A side of $S$ is twice the side of $R$ Compare their resistances. The direction of current is shown by an arrow head figure.
A) The resistance of $R$ is twice that of $S$
B) Both have the same resistance
C) The resistance of $S$ is four times that of $R$
D) The resistance of $R$ is half that of $S$
Explanation
(c) Both plates have same thickness,
$R_{R} = \frac{\rho l}{ld}\ and\ R_{s} = \frac{\rho 2l}{2ld}$
$\therefore\ \ \frac{R_{1}}{R_{2}} = 1$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.