Two equal negative charges `-q` each are fixed at points `(0,-a)` and `(0,a)` on y-axis. A positive chaarge `Q` is released from rest at the point `(2a,0)` on the x-axis. The charge Q will

Explanation

Let x be the displacement of charge Q at any time t. Now by finding the net force on Q and then its acceleration .a.
`a= 2kQ q(-x)/(m(x^(2) + l^(2))^(3//2))`
We can find that `a prop -x` not valid. Therefore charge Q will execute oscillations but not SHM.