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Four equal positive charges, each of value \( Q \), are arranged at the four corners of a square of diagonal \( 2 a \). A small body of mass \( m \) carrying a unit positive charge is placed at a height \( h \) above the center of the square.
What should be the value of \( Q \) in order that this body may be in equilibrium?
(1) \( \pi \varepsilon_{0} \frac{m g}{2 h}\left(h^{2}+2 a^{2}\right)^{3 / 2} \)                     
(2) \( \pi \varepsilon_{0} \frac{m g}{h}\left(h^{2}+a^{2}\right)^{3 / 2} \)
(3) \( \pi \varepsilon_{0} \frac{2 m g}{h}\left(h^{2}+2 a^{2}\right)^{3 / 2} \)                   
(4) \( \pi \varepsilon_{0} \frac{m g}{2 h}\left(h^{2}-a^{2}\right)^{3 / 2} \)
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