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The specific resistance of a wire is . If its volume is and its resistance is 3 ohms, then its length will be
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Correct option is D
Volume =Al=3 ⇒ A=3lNow R= ρ lA ⇒3=ρ × l3/l=ρl23 ⇒ l2 = 9ρ=3ρSimilar Questions
In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5Ω . The cable is replaced by 6 different insulated copper wires, the radius of each wire is 3 mm . Now the total resistance of the cable will be
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