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
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
Similar questions