A current of 10, A exists in a wire of crosssectional area of 5, mm ^{2} with a drift velocity of 2 times 10^{-3}, ms

Q: A current of $10\, A$ exists in a wire of crosssectional area of $5\, mm ^{2}$ with a drift velocity of $2 \times 10^{-3}\, ms ^{-1}$. The number of free electrons in each cubic meter of the wire is ..........

b $i =10 A , A =5 mm ^{2}=5 \times 10^{-6} m ^{2}$ and $v _{ d }=2 \times 10^{-3} m / s$ We know, $i= neAvd$ $\therefore 10= n \times 1.6 \times 10^{-19} \times 5 \times 10^{-6} \times 2 \times 10^{-3}$ $\Rightarrow n =0.625 \times 10^{28}=625 \times 10^{25}$

SECTION - A [PHYSICS - MCQ]

GSEB - English Medium

A current of $10\, A$ exists in a wire of crosssectional area of $5\, mm ^{2}$ with a drift velocity of $2 \times 10^{-3}\, ms ^{-1}$. The number of free electrons in each cubic meter of the wire is ..........

A$2 \times 10^{6}$
B$625 \times 10^{25}$
C$2 \times 10^{25}$
D$1 \times 10^{23}$

JEE MAIN 2021, Medium

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

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