A slab of material of dielectric constant K has the same area 'A' as the plates of a parallel plate capacitor and has a thickness \(\frac{3}{5}\)d, where 'd' is the separation between the plates. The change in capacitance (C') in terms of original capacitance C0\(\rm \left(C_0=\frac{\varepsilon_0A}{d}\right)\) when the slab is inserted between the plates is :
1
C0\(\rm \left(\frac{3K}{2K+5}\right)\)
2
C0\(\rm \left(\frac{5K}{2+3K}\right)\)
3
C0\(\rm \left(\frac{5K}{2K+3}\right)\)
4
C0\(\rm \left(\frac{2K+3}{5K}\right)\)