Find the angle at which the potential due a dipole is measured, when the distance from one charge is 12cm and that due to other is 11cm, separated to each other by a distance of 2cm.(a) 15(b) 30(c) 45(d) 60I had been asked this question in a national level competition.Enquiry is from Electric Dipole in chapter Electrostatic Fields of Electromagnetic Theory

Find the angle at which the potential due a dipole is measured, when t

1.	Find the angle at which the potential due a dipole is measured, when the distance from one charge is 12cm and that due to other is 11cm, separated to each other by a distance of 2cm.(a) 15(b) 30(c) 45(d) 60I had been asked this question in a national level competition.Enquiry is from Electric Dipole in chapter Electrostatic Fields of Electromagnetic Theory
Answer» Right answer is (d) 60 The explanation: Here, the two CHARGES are separated by d = 2cm. The distance from one charge (say Q1) will be R1 = 11cm. The distance from another charge (say Q2) will be R2 = 12CM. If R1 and R2 is assumed to be parallel, then R2 – R1 = d COS θ. We GET 1 = 2cos θ and cos θ = 0.5. Then θ = cos^-1(0.5) = 60.

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