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/sci/ - Science & Math

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>> No.7296205 [View]
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7296205

i have this expression on my book and i'm too retarded to understand it. an electron is travelling on a circular orbit, and the intensity of the current that it produces is

i = dq / dt = (dq/dr)(dr/dt) = (-e / 2*pi*r)*v

why the fuck does dq/dr = (-e / 2*pi*r)?

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