Question

Find the force between 2C and -1C separated by a distance 1m in air(in newton). (a) 18 X 10^6 (b) -18 X 10^6 (c) 18 X 10^-6 (d) -18 X 10^-6 I have been asked this question during an interview. Enquiry is from Coulomb Law topic in portion Electrostatic Fields of Electromagnetic Theory Select the correct answer from above options Electromagnetic Theory questions and answers, Electromagnetic Theory questions pdf, Electromagnetic Theory question bank, Electromagnetic Theory questions and answers pdf, mcq on Electromagnetic Theory pdf,electromagnetic theory book pdf,electromagnetic theory pdf notes,electromagnetic theory lecture notes,electromagnetic theory of light,maxwell electromagnetic theory,electromagnetic theory proposed by,electromagnetic theory engineering physics,electromagnetic theory nptel

Answer 1

Correct choice is (b) -18 X 10^6 The best I can explain: F = q1q2/(4∏εor^2) = -2 X 9/(10^-9 X 12) = -18 X 10^9.