A uniform metallic wire carries a current 2,A. when 3.4,V battery is connected across it. The mass of uniform metallic wire is 8.92 times 10^{-3}

Q: A uniform metallic wire carries a current $2\,A$. when $3.4\,V$ battery is connected across it. The mass of uniform metallic wire is $8.92 \times 10^{-3} \,kg$. density is $8.92 \times 10^3\,kg / m ^3$ and resistivity is $1.7 \times 10^{-8} \Omega- m$. The length of wire is $l=............\,m$

b $I =2\,A$ $\Delta V =3.4\,V$ Using Ohm's Law $R =\frac{3.4}{2}=1.7 \Omega$ $1.7=\frac{\rho L }{ A }$ $L =\frac{1.7( A )}{\rho}$ $M =(\text { density volume })$ $Volume =\frac{8.92 \times 10^{-3}}{8.92 \times 10^3}=10^{-6}$ $L ^2=\frac{1.7}{\rho}\left(10^{-6}\right)=\frac{1.7}{1.7} \times 10^2$ $L =10\,m$

SECTION - A [PHYSICS MCQ]

GSEB - English Medium

A uniform metallic wire carries a current $2\,A$. when $3.4\,V$ battery is connected across it. The mass of uniform metallic wire is $8.92 \times 10^{-3} \,kg$. density is $8.92 \times 10^3\,kg / m ^3$ and resistivity is $1.7 \times 10^{-8} \Omega- m$. The length of wire is $l=............\,m$

A$6.8$
B$10$
C$5$
D$100$

JEE MAIN 2023, Medium

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

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