If we take two plastic spheres and give them a positive electric charge, what is

Question

If we take two plastic spheres and give them a positive electric charge, what is the charge on each sphere if one sphere is 7 times the charge of the other and they are separated by 25 cm and them repulsive force between them is 0.72 N? Given -8.85 times 10^=-12 m^-3Kg^-1 s^-4 A^2 (Charge is uniformly distributed over the spheres) Two particles having charges q_1 = 0.230 nC and q_2 = 29 nC are separated by a distance 1.2 m. At what point along the line connecting the two charges is the total electric field due to the two charges equal to zero. When looking at an isolated spherical conductor which is 65 cm in diameter, how many excess electrons need to be added to produce an electric field of magnitude 30,000 N/C just outside the surface?

Explanation / Answer

resonate in 4 loop

fundamental frequency = f1 = 400/4 = 100Hz

2nd frequency = f2 =2f1 = 200 Hz

3rd resonance frequency = f3 = 3*f1 = 300 Hz

4th resonance frequency = f4 = 400 HZ

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