Uhmm 2 in 1 question (or problem). Coulumb's Law?

Two small plastic spheres (0.1 g each) are sliding freely along an insulating fiber (which makes an angle of 45 degrees with the horizontal). The fiber consisted of upper and lower knots that of the sliding of the spheres won't pass through. (a) If the lower sphere is resting against the lower knot while the upper sphere moves to a location 6 cm distant from that knot, find the charge on each. (b) If the charges remain the same, what angle should the fiber make with the horizontal to double the separation?





;p thanks!

Uhmm 2 in 1 question (or problem). Coulumb's Law?
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The verification of Coulomb's Law proceeds as follows :








1. Charges are put on the spherical conductors.





2. Because of the charge there is a force between the two spheres.





3. The force (F) between the spheres will produce a deflection ( ) of the sphere attached to the torsion fiber. These two quantities are related





F = k ( 6.2 )








where k is the torsion constant of the fiber.





4. The Q dependence is measured by adding charge ( to Q1 , say ) , keeping r constant and measuring ( and inferring F ).


5. The separation dependence is measured by charging the spheres and measuring ( and inferring F ) for various separations r.

teeth grills