Question 624: Current Electricity

Question

A copper wire of radius $$1 \mathrm{~mm}$$ contains $$10^{22}$$ free electrons per cubic metre. The drift velocity for free electrons when $$10 \mathrm{~A}$$ current flows through the wire will be (Given, charge on electron $$=1.6 	imes 10^{-19} \mathrm{C}$$ ) :

Accepted Answer

$$
\begin{aligned}
& \mathrm{I}=\mathrm{neAV_{d }} \
& \mathrm{V}_{\mathrm{d}}=\frac{\mathrm{I}}{\mathrm{neA}}=\frac{10}{10^{22} 	imes 1.6 	imes 10^{-19} 	imes \pi 	imes 10^{-6}} \
& \mathrm{~V}_{\mathrm{d}}=\frac{6.25}{\pi} 	imes 10^3 \mathrm{~m} / \mathrm{sec}
\end{aligned}
$$

Answer

$$\frac{6.25 	imes 10^4}{\pi} \mathrm{ms}^{-1}$$

Answer

$$\frac{6.25}{\pi} 	imes 10^3 \mathrm{~ms}^{-1}$$

Answer

$$\frac{6.25}{\pi} \mathrm{ms}^{-1}$$

Answer

$$\frac{6.25 	imes 10^5}{\pi} \mathrm{ms}^{-1}$$

Current Electricity

A copper wire of radius $1 \mathrm{~mm} contains 10^{22} free electrons per cubic metre. The drift velocity for free electrons when 10 \mathrm{~A} current flows through the wire will be (Given, charge on electron =1.6 \times 10^{-19} \mathrm{C}$ ) :

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