**Identify the correct statements :**
A. Effective capacitance of a series combination of capacitors is always smaller than the smallest capacitance of the capacitor in the combination.
B. When a dielectric medium is placed between the charged plates of a capacitor, displacement of charges cannot occur due to insulation property of dielectric.
C. Increasing of area of capacitor plate or decreasing of thickness of dielectric is an alternate method to increase the capacitance.
D. For a point charge, concentric spherical shells centered at the location of the charge are equipotential surfaces.
Choose the **correct** answer from the options given below :
Answer: (A) A, C and D Only
A: $\dfrac1{C_s} = \sum\dfrac1{C_i} > \dfrac1{C_{\min}}$, so $C_s < C_{\min}$ ✓
B: A dielectric does get polarised: bound charges are displaced slightly within the molecules, which is exactly why capacitance increases ✗
C: $C = \dfrac{K\varepsilon_0 A}{d}$, so larger $A$ or smaller $d$ increases $C$ ✓
D: $V = \dfrac{kq}{r}$ is constant on any sphere centred on the charge ✓
So A, C and D only.
Solution by Sreeraj P, M.Sc Physics