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The resistance of a wire is 20 ohms. It is so stretched that the length becomes three times, then the new resistance of the wire will be
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Correct option is D
In case of stretching of wire R ∝ l2⇒ If length becomes 3 times, resistance becomes 9 timesi.e., R' =9 × 20=180 ΩSimilar 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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