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Aluminium wire has a radius 0.25mm …

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Aluminium wire has a radius 0.25mm and length 75m. If the resistance of the wire is 10ohm calculate the resistivity of aluminium

Posted by Amaldev. B. S 5 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 4 months ago

Resistivity = (R x A)/length
Radius = 0.25mm = 0.00025 m
length = 75m
Resistance = 10 ohms
Area of cross section = πr^2
= 22/7 x 0.00025 x 0.00025
Resistivity =
(10 x 22/7 x 0.00025 x 0.00025 ) ÷ 75
= (220/7 x 0.00025 x 0.00025)/75
= 2.63 x 10^(-8)ohmmeter

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Posted by Pandey Ji 5 months, 4 weeks ago

CBSE > Class 10 > Science