# the sides of rectangular block are are 2cm, 3cm, and 4cm.the ratio of maximum to minimum resistance between its parallel faces is ?

Dear Student,

$Weknowthat,\phantom{\rule{0ex}{0ex}}R=\frac{\rho l}{A}\phantom{\rule{0ex}{0ex}}Now,{R}_{max}=\frac{\rho \times 4}{2\times 3}=\frac{2\rho}{3}\phantom{\rule{0ex}{0ex}}and{R}_{min}=\frac{\rho {l}_{min}}{{A}_{max}}=\frac{\rho \times 2}{4\times 3}=\frac{\rho}{6}\phantom{\rule{0ex}{0ex}}\frac{{R}_{max}}{{R}_{min}}=4$

The ratio is 4:1 .

Regards

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