a wire of 10Ω of resistence is stretched to thrice its original length what will be its first new resistivity second new resistence ? plzz give me its correct answer
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R become thrice.
Resistivity is matarial's property so can't changed.
Resistivity is matarial's property so can't changed.
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Cosmicaishwary07:
no i think u took fault here
i gave u the value of resistence also
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1
1.
Resistivity is independent of length of the wire. It’s remains same
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2.
R = ρL/A
R = ρL/A * (L/L)
R = ρL^2 / V
When it is stretched ρ and V remains constant
R ∝ L^2
R1/R2 = (L1/L2)^2
R2 = R1 * (L2/L1)^2
R2 = 10 * (3L1/L1)^2
R2 = 10 * 9
R2 = 90Ω
Resistivity is independent of length of the wire. It’s remains same
__________________________
2.
R = ρL/A
R = ρL/A * (L/L)
R = ρL^2 / V
When it is stretched ρ and V remains constant
R ∝ L^2
R1/R2 = (L1/L2)^2
R2 = R1 * (L2/L1)^2
R2 = 10 * (3L1/L1)^2
R2 = 10 * 9
R2 = 90Ω
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