For two charges 3C and -3C separated by 1cm and are located at distances 5cm and 7cm respectively from the point P, then the distance between their midpoint and the point P will be(a) 5.91(b) 12.6(c) 2(d) 9This question was addressed to me during an internship interview.I'd like to ask this question from Electric Dipole in section Electrostatic Fields of Electromagnetic Theory

For two charges 3C and -3C separated by 1cm and are located at distanc

1.	For two charges 3C and -3C separated by 1cm and are located at distances 5cm and 7cm respectively from the point P, then the distance between their midpoint and the point P will be(a) 5.91(b) 12.6(c) 2(d) 9This question was addressed to me during an internship interview.I'd like to ask this question from Electric Dipole in section Electrostatic Fields of Electromagnetic Theory
Answer» Right answer is (a) 5.91 Explanation: For a DISTANT POINT P, the R1 and R2 will approximately be equal. R1 = R2 = R, where r is the distance between P and the midpoint of the two charges. Thus they are in geometric progression, R1R2=r^2 Now, r2 = 5 X 7 = 35. We get r = 5.91cm.

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