Question

a wire of length 40 cm and area of cross section 0.1 millimetre square has a resistance of 0.8 ohm calculate the resistivity of wire in SI unit ?
​

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:

Mark as brainlist