Coulumb's Law for small spheres

Electricity and Magnetism Level 2

Two small, identical spheres, one positively charged and other negatively charged, when placed 0.5m apart, they attract each other with a force of 0.108N. If they are brought in contact for some time and again separated by 0.5m, they repel each other with a force of 0.036N. What were the initial charges on the spheres?

Details and Assumptions:

Coulumb's Constant k= 9 * 10^{9}

q1 = +3.0 * 10 ^{-12} and q2= -1.0 * 10 ^{-12} q1= +1.0 * 10^{-12} and q2 = -3.0 * 10^{-12} q1 = +3.0 * 10^{-6} and q2= -1.0 * 10^{-6} q1= +1.0 * 10 ^{-6} and q2 = -3.0 * 10^{-6}

Smit Kiri by Smit Kiri , 23, India

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