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The specific resistance of a wire is `rho`, its volume is `3 m^(3)` and its resistance is `3 ohms`, then its length will beA. `sqrt((1)/(rho))`B. `(1)/(sqrtrho)`C. `(1)/(rho) sqrt3`D. `rho sqrt((1)/(3))` |
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Answer» Correct Answer - B (b) Volume `= Al = 3 implies A = (3)/(l)` Now `R = rho (l)/(A) implies 3 = (rho xx l)/(3//l) = (rho l^(2))/(3) implies l^(2) = (9)/(rho) = (3)/(sqrt(rho))` |
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