Question

Q.1)The resistence of awire is 25ohm of length 50cm and having area of 15cm sq.Find the resistivity of the wire. (please answer I need it urgent please)​

Answer 1

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