Question

estimate the number of free electrons in a copper wire of length 1m and diameter 1mm?​

Answer 1

Explanation:

Correct option is

B

0.1 mm/s

Electron density n=

M

N

A

ρ

=

63×10

−3

(6.023×10

23

)×(9×10

3

)

=0.86×10

29

m

−3

Drift velocity v

d

=

neA

I

=

(0.86×10

29

)×(1.6×10

−19

)×π(0.5×10

−3

)

2

1.1

=0.1×10

−3

m/s=0.1 mm/s

Answer 2

Answer:Correct option isB0.1 mm/sElectron density n= MN A ρ = 63×10 −3 (6.023×10 23 )×(9×10 3 ) =0.86×10 29 m −3 Drift velocity v d = neAI = (0.86×10 29 )×(1.6×10 −19 )×π(0.5×10 −3 ) 2 1.1 =0.1×10 −3 m/s=0.1 mm/s.

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