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Find the force between two charges when they are brought in contact and separated by 4cm apart, charges are 2nC and -1nC, in μN.(a) 1.44(b) 2.44(c) 1.404(d) 2.404I have been asked this question during an online interview.My question is based upon Coulomb Law topic in division Electrostatic Fields of Electromagnetic Theory

Answer»

Right ANSWER is (c) 1.404

Easy explanation: Before the charges are brought into contact, F = 11.234 μN.

After charges are brought into contact and then SEPARATED, charge on each sphere is, (q1 + Q2)/2 = 0.5nC

On calculating the FORCE with q1 = q2 = 0.5nC, F = 1.404μN.



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