Physics - Capacitor Question with Solution | TestHub

A parallel plate capacitor with air as dielectric is arranged horizontally. The lower plate is fixed and the upper plate is connected with a spring of force constant K as shown in the figure. The area of each plate is A and the mass of the upper plate is m. The capacitor is connected with an electric source of voltage V. In steady position, the distance between the plates is d. Now the upper plate is slightly displaced in the vertical direction. Angular frequency of small vertical oscillations is: