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Resistance of a wire of length …

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Resistance of a wire of length 2 metre is 40 ohm. If the diameter of wire is 0.3 millimetre what would be the resistivity of the motor

Posted by Disha Agarwal 5 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Namrata Jindal 5 years, 4 months ago

So, r (radius) = 0.15 mm = 0.15*10^-3m Resistivity, p = R*A / l = R*πr^2 / l = 40*3.14*(0.15*10^-3) ^2 / 2 = 20*3.14*2.25*10^-6 = 3.14*45*10^-6 = 140.9*10^-6 = 1.409 * 10 ^-4 Therefore, the resistivity is 1.409 * 10^-4 ohm-m.

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Pritu Pandey 5 years, 4 months ago

Hii 143

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Posted by Pandey Ji 5 months, 4 weeks ago

CBSE > Class 10 > Science