the length of the wire is 10 m.and the diameter is 2 mm.if the resistivity of the substance of the wire is 2×10^-6 ohm cm.then the resistance of the wire is
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Given,length,l=10m
resistance of wire is 2❌ 10^-6ohm/cm
1cm=10^-6 ohm
so,1/ m=10^-6 ohm
1m=10^-4 ohm.
The resistance in 10m length wire= length ❌R per metre
=10❌10^-4ohm
=10^-3 ohm.
The resistance across the diameter of circular wire of diameter 1mm i.e 10^-3m
= 10^-3❌10^-4 ohm
=10^-7 ohm.
Thank you!
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