SSC JE Electrical Engineering 22 Jan 2018 Evening Paper

Question : 106 of 200

Marks: +1, -0

What will be the cross-sectional area (in sq. m) of an 18 m long cylindrical wire when the resistivity of the wire is 0.67 ohm-meter and the resistance of the wire is 12 ohms?

Validate

Solution:

l = 18 m
ρ = 0.67 Ω – m
R = 12 Ω
A = ?
Resistance of conductor is given by R =

{\ρl}/A

∴A={\ρl}/R

={0.67×18}/12

= 1.005 \m^2

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