Question

a wire of length 7.5 m long having area of cross section 10mm^2 passes a current of 5.9 A when connected to a 220 v source . calculate resistivity of wire​

Answer 1

Answer:

ANSWER

Given : A=10 mm

2

=10×10

−6

m

2

n=5×10

20

/m

3

Current I=

R

V

=

5

25

=5 A

Drift velocity V

d

=

Ane

I

⟹ V

d

=

10×10

−6

×5×10

20

×1.6×10

−19

5

=6.25×10

3

m/s