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A wire has radius 0.42mm and …

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A wire has radius 0.42mm and resistivity of 34 ×10^-8 ohm.metre .find the length of wire if the resistance is 20 ohm

Posted by Devaanshi Mehta 6 years, 10 months ago

CBSE > Class 10 > Science

1 answers

Ashutosh Kumar 6 years, 10 months ago

Resistance = 20 ohm Resistivity = 34*10^-8 Radius (r) = 0.42mm = 42*10^-5 m Area of cross section = πr^2 = 5544*10^-10 sq. m Resistance = (Resistivity*Length)/Area of cross section Therefore, Length = (Resistance*Area)/Resistivity L = (20*5544*10^-10)/34*10^-8 = 32.611m

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