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sadsociety41
14.07.2019 •
Physics
Two small balls, each of mass 5.0 g, are attached to silk threads 50 cm long, which are in turn tied to the same point on the ceiling, as shown below. when the balls are given the same charge q, the threads hang at 5.0° to the vertical, as shown below. what is the magnitude of q? what are the signs of the two charges?
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Ответ:
In triangle ABC
Sin5 = BC/AC
BC = (AC) Sin5
BC = (50) Sin5 = 4.36 cm
r = distance between the two balls = 2 BC = 2 x 4.36 = 8.72 cm = 0.0872 m
q = charge on each ball
m = mass of each ball = 5 g = 0.005 kg
electric force between the two balls is given as
F =![\frac{kq^{2}}{r^{2}}](/tpl/images/0089/0884/1c103.png)
using equilibrium of force in vertical direction
T Cos5 = mg eq-2
Using equilibrium of force in horizontal direction
T Sin5 = F eq-3
dividing eq-3 by eq-2
T Sin5 /(T Cos5) = F/mg
F = mg tan5
using eq-1
inserting the values
q = 2.03 x 10⁻⁷ C
sign of charge is same on both the balls. either it is negative or positive
Ответ:
Physiotherapy
Explanation:
Hope it helps.