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(C) The resistance $R$ of a conductor is given by the formula $R = \rho \frac{l}{A_{cs}}$,where $\rho$ is the resistivity,$l$ is the length,and $A_{cs

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(C) The resistance $R$ of a conductor is given by the formula $R = ho \frac{l}{A_{cs}}$,where $ho$ is the resistivity,$l$ is the length,and $A_{cs}$ is the cross-sectional area.For a square plate of side length $l$ and thickness $t$,the cross-sectional area through which current flows is $A_{cs} = l 	imes t$.Thus,the resistance is $R = ho \frac{l}{l 	imes t} = \frac{ho}{t}$.Since both plates $A$ and $B$ are made of the same metal (same $ho$) and have the same thickness $(t)$,the resistance of each plate is independent of its side length.Therefore,$R_A = \frac{ho}{t}$ and $R_B = \frac{ho}{t}$.The ratio of the resistances is $\frac{R_A}{R_B} = \frac{ho/t}{ho/t} = 1:1$.

$A$ and $B$ are two square plates of the same metal and same thickness,but the length of $B$ is twice that of $A$. The ratio of the resistances of $A$ and $B$ is

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