# The specific resistance of a wire is "rho" ,its volume is 3m3 and its resistance is 3 ohm, then its length will be a.underroot 1/ rho b. 3/ underroot rho c.1/ rho * underroot 3 d. rho * underroot 1/3

2
by Jyo18

2015-04-14T18:41:21+05:30

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Volume of wire V = length L * area of cross section A
A = V/L

ρ = resistivity of the material.

Resistance of a wire R = ρ L / A = ρ L² / V

L² =  V R / ρ  = 3 m³ * 3 Ω /ρ

L = 3/√ρ

the option is b.

2015-04-14T18:42:50+05:30

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