Question

A charge +Q fixed on the Y axis at a distance of 1m from the origin and another
charge +2Q is fixed on the X axis at a distance of 2 m from the origin. A third
charge- Q is placed at the origin. What is the angle at which it moves?

Answer 1

the value of cos(theta) will be

a/(a^2+y^2)^(1/2)

and, the exponent of

a^2+y^2

will be 3/2 instead of 2

otherwise, the answer is dimensionally incorrect

Answer 2

the answered is 3/2........ but this question are not correct ....