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The resistivity of the material of …

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The resistivity of the material of the wire is 44 x 10-⁸ ohm m. If the resistance of the wire is 14ohm and it's diameter is 1mm , calculate the length of the wire.

Posted by Saumya Singh 3 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Saksham Singh 3 years, 3 months ago

2500 m

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Abhinav Mishra 3 years, 3 months ago

Given : resistivity of the conductor = 44 * 10^-8 ohm m. R = 14 ohm Diameter = 1mm Area = πD^2/4 = π/4 * (10^-3)^2 m^2 we know that, length of wire = resistance * area/ resistivity of the conductor =. 14 * π/4 * (10^-6)* 1/44*10^-8 = 14 * (22/7*4 )* 10^-6 *1/44*10^-8 = 14 * 22/28 * 100/44 = 22/2 * 100/44 = 100/4 = 25m

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