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प्रश्न
Calculate the resistance of an aluminium cable of length 10 km and diameter 2.0 mm if the resistivity of aluminium is 27 × 10−8 Ωm.
उत्तर
Let the resistance of the aluminium cable be R.
We know that `R=l/A`
R=P/A
`R=27xx10-8xx103.14xx10-8`
`R=(27xx10^-8xx10000)/(3.14xx10^-8)`
R = 86 Ω
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