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

Question

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

Tardigrade Admin · Accepted Answer

vd=(i/A n e) ; As A uparrow so vd downarrow ⇒ vP > vQ

Q. 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 $v_{P}$ and $v_{Q} .$ Then

$v_{P} = v_{Q}$

$v_{P} < v_{Q}$

$v_{P} > v_{Q}$

data insufficient

$v_{d} = \frac{i}{A n e};$ As $A ↑$ so $v_{d} ↓\Rightarrow v_{P} > v_{Q}$

Q. 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

vP​=vQ​

vP​<vQ​

vP​>vQ​