Hi , i made this question yesterday, and it follows :
Consider an infinitely large wire (blue) having charge per unit length \(+ \lambda\), and a finite length wire (red) of length \(l\) and mass \(m\) having the same charge per unit length. Its lower end rests at a height of \(h\) units from the blue wire,as shown in the figure.
Your task is simple. Find the frequency of oscillation of red wire on being disturbed by a small distance vertically