Dimensions of a block are $1\,cm \times 1\,cm \times 100\,cm$. If specific resistance of its material is $3 \times {10^{ - 7}}\,ohm - m$, then the resistance between the opposite rectangular faces is
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Length $l = 100\,cm =1\,m$
Area of cross-section $A = 1 \,cm \times 1 \,cm= 1\, cm^2 = 10^{-4} \,m^2$
Resistance $ R = 3 \times 10^{-7} \times \frac{{{1}}}{{{{10}^{ - 4}}}}= 3 \times 10^{-3}\, ohm$
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