JEE Mains Model Paper 5

A parallel plate capacitor without any dielectric has capacitance C0. A dielectric slab is made up of two dielectric slabs of dielectric constants K and 2K and is of same dimensions as that of capacitor plates and both the parts are of equal dimensions arranged serially as shown. If this dielectric slab is introduced(dielectric K enters first) in between the plates at constant speed, then variation of capacitance with time will be best represented by: