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Byju's Answer
Standard XII
Physics
Drift Velocity
Estimate the ...
Question
Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area
1.0
×
10
−
7
m
2
carrying a current of
1.5
A
. Assume the density of conduction electrons to be
9
×
10
28
m
−
3
.
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Solution
Since, drift velocity,
v
d
=
I
n
A
q
where,
I
is the current,
n
is the charge density,
q
is charge of the electron, and
A
is cross-sectional area.
v
d
=
1.5
9
×
10
28
×
1.0
×
10
−
7
×
1.6
×
10
−
19
v
d
=
10.4
×
10
−
4
m
/
s
Suggest Corrections
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Similar questions
Q.
Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area
1.0
×
10
−
7
m
2
carrying a current of
1.5
A
. Assume that each copper atom contributes roughly one conduction electron. The density of copper is
9.0
×
10
3
k
g
m
−
3
and its atomic mass is
63.5
a
m
u
.
Q.
The cross-sectional area of a wire is
1.0
×
10
−
7
m
2
and the density of free electrons is
2.0
×
10
28
m
−
3
What will be the drift velocity of the free electrons for a current of
3.2
A
in the wire?
Q.
Copper contains
8.4
×
10
28
free electrons
/
m
3
. A copper wire of cross-sectional area
7.4
×
10
−
7
m
2
carries a current of
1
A. The electron drift speed is approximately.
Q.
At room temperature, copper has free electron density of
8.4
×
10
28
m
−
3
. The electron drift velocity in a copper conductor of cross-sectional area of
10
−
6
m
2
and carrying a current of
5.4
A
, will be
Q.
If the conduction-electron density in copper wire is
n
, the area of cross-section of wire is A and the average drift speed of electron
V
d
, then the net number of electrons crossing a cross-section of the wire in a unit time interval
t
will be
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