what is the resistance of one of the rails of a railway track 20km long at 20°c ? the cross section area of rail is cm2 and the rail is made of steel having resistivity at 20°c as 6×10 to the power minus 8
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Answered by
28
Answer:
R = pL/A
Explanation:
R = pL/A
=( 6*10^-8 )* 20,000/A
= (12*10^-4)*/(25/10000)
= 12/25 ohm
R = 12*4 / 25*4 = 48/100 ohm
= 0.48 ohm
Answered by
2
Explanation:
cross section area 25 centimetre
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