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  4. 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 in figure.

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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 in figure.Physics Question Image

Current Electricity

Solution:

Both plates have same thickness,
$R_{R}=\frac{\rho l}{i d} \text { and } R_{s}=\frac{\rho 2 l}{2 l d}$
$\therefore \frac{R_{1}}{R_{2}}=1$