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 8 times the charge of the other and they are separated by 30 cm and the repulsive force between them is 0.88 N? Given epsilon_0 = 8.85 Times 10^-12 m^-3Kg^-1s^4A^2 The charge is distributed uniformly over the spheres. 1.9 Times 10^_7 C, 3.4 Times 10^-6 C 1.8 Times 10^-8 C, 2.6 Times 10^-7 C 1.0 Times 10^-6 C, 8.0 Times 10^-6 C 1.5Times 10^-6 C, 1.2 Times 10^-5 C 1.0 Times 10^-6C, 1.0 Times 10^-6 C

Explanation / Answer

q1 = q, q2 = 8q, r = 30 cm

electric force F =kq1q2/r^2

k =1/4pi*eo

0.88 = q*8q/(4*3.14*8.85*10^-12*0.3*0.3)

q =1*10^-6 C

q1 =1*10^-6 C, q2 = 8*10^-6 C

correct option is (c)

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