Homework Answers
(iii)
The x components of the fields due to same kind of charges get cancelled and the y components get added up.
The field due to positive charge is directed down ward and that of the negative charge is directed upward.
The net field at the point P due to given system of charges is difference in fields due to two opposite kind of charges.
Moreover the angle subtended by the line joining the point and positive charge is greater than that of the negative charge, thus the field due to positive charges will be greater and hence the net field is directed downwards
** other three cases were not posted***
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