a wire of length 10cm has a resistance of 4 ohm if the wire is stretch to double lenght find the new resistanceà
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Original resistance =Ro=ρ×AI
The resistance of conductor is directly proportional to its length and inversely proportional to its cross sectional area.
The wire tripled of its previous length so the length will be 3l
And the new cross sectional area will be 3A
Rn=3×ρ×A/3l
=9R=9ρ×Al
=9×3=27 ohm
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