Question

Mass of an electric wire of diameter 4mm has mass 3.52 kg . Density of the material of

the wire is 7 *10^3

kg/ m^3

. If resistivity of the wire is 3.45*10^-6 ohm*m , then find the

resistance of the wire.​

Answer 1

Answer:

Given : R=2Ω l=1 m d=0.4 mm =0.0004 m

Cross section area of wire A=

4

πd

2

=

4

π×(0.0004)

2

=1.256×10

−7

m

2

Resistivity of the material ρ=

l

RA

∴ ρ=

1

2×1.256×10

−7

=2.514×10

−7

Ωm

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