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Standard XII
Physics
Drift Velocity
Question
For which of the following dependence of drift velocity
v
d
on electric field E, is Ohm's law obeyed?
v
d
=
constant
v
d
=
E
1
/
2
v
d
∝
E
v
d
∝
E
2
A
v
d
∝
E
2
B
v
d
=
E
1
/
2
C
v
d
=
constant
D
v
d
∝
E
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Solution
Verified by Toppr
Assume a conductor of
length
l
,
charge carrier density
n
,
drift velocity
v
d
,
cross sectional area
A
,
It is placed in an uniform electrical field (
E
)
current through the conductor (
i
)
=
n
×
l
×
A
×
q
t
where
q
is the charge of a carrier(electron) and
t
is the time taken by carrier to pass through conductor
⇒
v
d
=
l
t
⇒
i
=
n
×
v
d
×
A
×
q
.......(1)
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