A current I flows through a uniform wire of diameter d when the mean electron drift velocity is V. The same current will flow through

Q: $A$ current $I$ flows through a uniform wire of diameter $d$ when the mean electron drift velocity is $V$. The same current will flow through a wire of diameter $d/2$ made of the same material if the mean drift velocity of the electron is :

d $j=\frac{I}{A}=n e v_{d}$ $\frac{4 I}{\pi d^{2}}=n e v$ $\frac{161}{\pi d^{2}}=n e v^{\prime}$ From equaiton $( I )$ and $( II )$ $\frac{4 I}{16 I}=\frac{v^{\prime}}{v^{\prime}} \Rightarrow v^{\prime}=4 v$

SECTION - A [PHYSICS - MCQ]

GSEB - English Medium

$A$ current $I$ flows through a uniform wire of diameter $d$ when the mean electron drift velocity is $V$. The same current will flow through a wire of diameter $d/2$ made of the same material if the mean drift velocity of the electron is :

A$v/4$
B$v/2$
C$2v$
D$4v$

Medium

STD 11 Science
NEET
STD 12 - 3. current electricity
Physics

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