Problem P. 4626. (March 2014)
P. 4626. There are two alike initially uncharged spheres of radius r at a distance of dr, as shown in the figure.
a) Switch is closed. What is the force exerted between the two spheres?
b) What would be the force between the two spheres, if in the previous experiment instead of closing switch , switch was closed?
c) Determine the force exerted between the spheres if both switches are closed.
(6 pont)
Deadline expired on April 10, 2014.
Sorry, the solution is available only in Hungarian. Google translation
Megoldásvázlat. Mindhárom esetben vonzóerő alakul ki:
\(\displaystyle F_{(a)}=\frac{U^2}{4k}\left(\frac{r}{d}\right)^2,\quad F_{(b)}=\frac{2U^2}{ k}\left(\frac{r}{d}\right)^5,\quad
F_{(c)}=\frac{U^2}{k}\left(\frac{r}{d}\right)^3.\)
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