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KEAM 2017 Physics and Chemistry Paper
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© examsnet.com
Question : 13
Total: 120
A copper wire with a cross-section area of
2
×
10
−
6
m
2
has a free electron density equal to
5
×
10
22
∕
c
m
3
. If this wire carries a current of 16A, the drift velocity of the electron is
1 m/s
0.1 m/s
0.01 m/s
0.001 m/s
0.0001 m/s
Validate
Solution:
Drift velocity,
V
d
=
I
n
e
A
Given,
n
=
5
×
10
22
/
c
m
3
=
5
×
10
22
×
10
6
/
m
3
e
=
1.6
×
10
−
19
C
A
=
2
×
10
6
m
2
I
=
16
A
v
d
=
16
5
×
10
28
×
1.6
×
10
−
19
×
2
×
10
−
6
=
1
10
3
=
0.001
m
/
s
© examsnet.com
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