Question about FAR FIELD for problem 1.2 (which is given at the absolute bottom):

I just wanted to ask/confirm if, for problem 1.2, the far-field equation for the electric field is the same as the electric field equation for the regular cases (i.e. for the cases that are neither near-field nor far-field cases) for all electric dipoles (unlike the situation in problem 1.1 – where the two charges are of the same sign – which allows one to approximate the two charges as one charge with double the magnitude of the charge).

Problem 1.1:
http://www.tiikoni.com/tis/view/?id=e0c389a

Question

Question about FAR FIELD for problem 1.2 (which is given at the absolute bottom):

I just wanted to ask/confirm if, for problem 1.2, the far-field equation for the electric field is the same as the electric field equation for the regular cases (i.e. for the cases that are neither near-field nor far-field cases) for all electric dipoles (unlike the situation in problem 1.1 – where the two charges are of the same sign – which allows one to approximate the two charges as one charge with double the magnitude of the charge).

Problem 1.1:
http://www.tiikoni.com/tis/view/?id=e0c389a

s3a · Answer

Problem 1.2: http://www.tiikoni.com/tis/view/?id=9ff01bc

anonymous · Answer

Yes. If the distance between the point and the charges is way larger than the distance between the charges, you can consider the system of charges to behave like a single point charge with a charge of 2q.