In the arrangement shown in figure a. dielectric slab of dielectric constant `K` is partially inside a parallel plate capacitor. Assuming gravity to be absent, calculate the extension in the spring if the whole system is in equilibrium. If the slab is slightly displaced will it perform SHM? If the liattery is disconnected and then the slab is slightly displaced, will it perform SHM?
Given that `I` is the length of the plates, ``b is the breadth of plates and dis the separation between the plates.