Calculate the resistance of an aluminium cable of length 10 km and diameter 20 mm
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length of the cable =10 km =10^4
diameter of the cable =2mm
radius =10^-3m
resistivity of aluminium =2.7×10^8
resistance R =resistivity of aluminium×length/area
=2.7×10^8×10^4/(3.14×10^-6)
=86 ohm
diameter of the cable =2mm
radius =10^-3m
resistivity of aluminium =2.7×10^8
resistance R =resistivity of aluminium×length/area
=2.7×10^8×10^4/(3.14×10^-6)
=86 ohm
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