Question 728: Current Electricity

Question

A silver wire of radius $$0.1 \mathrm{~cm}$$ carries a current of $$2 \mathrm{~A}$$. If the charge density in silver is $$5.86 	imes 10^{28} \mathrm{~m}^{-3}$$, the drift velocity is

Accepted Answer

$$\begin{aligned}
& 	ext { } \quad v_d=\frac{I}{\pi A e} \
& 	ext { Given, } I=2 \mathrm{~A}, n=5.86 	imes 10^{28} \mathrm{~m}^{-3}, \
& A=\pi r^2=\pi\left(0.1 	imes 10^{-2}ight)^2, e=1.6 	imes 10^{-19} \mathrm{C} \
& 	herefore \quad v_d=0.68 	imes 10^{-4} \mathrm{~m} / \mathrm{s}
\end{aligned}$$

Answer

$$0.2 	imes 10^{-3} \mathrm{~m} / \mathrm{s}$$

Answer

$$0.4 	imes 10^{-4} \mathrm{~m} / \mathrm{s}$$

Answer

$$0.68 	imes 10^{-4} \mathrm{~m} / \mathrm{s}$$

Answer

$$7 	imes 10^{-4} \mathrm{~m} / \mathrm{s}$$

Current Electricity

A silver wire of radius $0.1 \mathrm{~cm} carries a current of 2 \mathrm{~A}. If the charge density in silver is 5.86 \times 10^{28} \mathrm{~m}^{-3}$, the drift velocity is

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