An electric field on a plane is described by its potential V = 20(r^-1 + r^-2), where r is the distance from the source. The field is due to(a) A monopole(b) A dipole(c) Both a monopole and a dipole(d) A quadrupleI got this question in an interview.My enquiry is from Advanced and Tricky Questions topic in section Advanced and Tricky Questions of Electromagnetic Theory

An electric field on a plane is described by its potential V = 20(r^-1

1.	An electric field on a plane is described by its potential V = 20(r^-1 + r^-2), where r is the distance from the source. The field is due to(a) A monopole(b) A dipole(c) Both a monopole and a dipole(d) A quadrupleI got this question in an interview.My enquiry is from Advanced and Tricky Questions topic in section Advanced and Tricky Questions of Electromagnetic Theory
Answer» The CORRECT ANSWER is (c) Both a monopole and a dipole To explain I WOULD say: In the potential given, ONE component is inversely proportional to r, which is due to a monopole and the other component is inversely proportional to r^2, which is due to a dipole.

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