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February 27, 2015

February 27, 2015

Posted by **lisa** on Saturday, May 28, 2011 at 5:46pm.

Определить линейную плотность заряда бесконечно длинной нити, если работа сил поля по перемещению заряда Q = 1 нКл с расстояния r₁ = 5 cм до r₂ = 2 см в направлении перпендикулярном нити равна 50 мкДж.

- physics -
**Damon**, Saturday, May 28, 2011 at 6:02pmI am not sure how much your book gives you.

I will assume that you know that:

E = [ 1/(2pieo) ] lambda/r

where lambda = charge per unit length

and

r is distance perpendicular to the line

then

Voltage potential of point a at ra with respect to potential at point b at rb is:

Va -Vb = integral from a to b of E dr

= [lambda/(2pieo)]integral dr/r

= [lambda/(2pieo)] ln (rb/ra)

calculate that

now

work done = charge* voltage difference

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