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Standard XI
Physics
Current and Drift Velocity Relation
A wire has a ...
Question
A wire has a non-uniform cross-sectional area as shown in figure. A steady current i flows through it. Which one of the following statement is correct
A
The drift speed of electron is constant
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B
The drift speed increases on moving from A to B
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C
The drift speed decreases on moving from A to B
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D
The drift speed varies randomly
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Solution
The correct option is
C
The drift speed decreases on moving from A to B
For a conductor of non-uniform cross-section
v
d
∞
1
A
r
e
a
o
f
c
r
o
s
s
−
s
e
c
t
i
o
n
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