Question

Resistance of a metal wire of length 1 metre is 22 ohm at 20°C. If diametre of wire is 0.4 mm, what will be the resistivity at that temperature?​

Answer 1

Answer:

ANSWER

R=26 Ω

l=1m

d−0.3mm

r=

2

d

=

2

0.3×10

−3

=0.15×10

−3

m

A=πr

2

=3.14×(0.15×10

−3

)

2

=0.071×10

−6

m

2

R=

A

ρL

or ρ=

l

RA

=

1

26×0.071×10

−6

=1.84×10

−6

Ωm

Explanation:

Hope this helps