Question

calculate the resistance of a copper of 50m and diameter of 1m

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

Explanation: