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Questions  

A wire has a non-uniform cross-section as shown in figure. A steady current flows through it. The drift speed of electrons at points P and Q is vP  and  vQ. Then

a
vP = vQ
b
vP < vQ
c
vP > vQ
d
data insufficient

detailed solution

Correct option is C

vd=iAne;  As  A  ↑  so vd ↓  ⇒  vP  >  vQ

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