Physics, asked by sadhanajamkatel, 1 month ago

The drift velocity of electrons is 2mm/s for a metal wire having diameter 2mm. What will be the drift velocity (in mm/s) of electrons if the another wire of diameter 1mm of the same material is introduced? a. 1 b. 2 c. 4 d. 8​

Answers

Answered by joywadhwa01
1

Answer:  Given

I=1A

A=2 mm  

2

=2×10  

−6

 m  

2

 

μ  

e

=8.5×10  

22

 cm  

−3

=8.5×10  

28

 m  

−3

 

The current flowing through the Cu wire is

I=μ  

e

.e.A.v  

d

 

where, e is the charge on electron and v  

d

 is the drift velocity of electrons.

∴v  

d

=  

μ  

e

.e.A

I

 

∴v  

d

=  

(8.5×10  

28

)(1.6×10  

−19

)(2×10  

−6

)

1

 

∴v  

d

=  

27.2×10  

3

 

1

 

∴v  

d

=0.03676×10  

−3

 ms  

−1

 

∴v  

d

≈0.036 mms  

−1

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