In an electrostatic machine, a belt of width w, having a surface ch...

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In an electrostatic machine, a belt of width w, having a surface charge density \( \sigma \), travels with velocity v. As the belt passes a certain point, all the charge are removed and is carried away as an electric current. The magnitude of this current is
(1) \( w v \sigma \)
(2) \( \frac{W \sigma}{v} \)
(3) \( w v^{2} \sigma \)
(4) \( \frac{V \sigma}{W} \)
\( \mathrm{P} \)
W)
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