Question

What is When a Metallic Slab is Inserted between the Plates?

Answer

When a Metallic Slab is Inserted between the Plates - As dielectric constant of metal is infinite. Hence, field inside the slab does not exists. Capacitance, C' = ε₀A/(d - t), In case of partial filling and in case of complete filling, C' = ∞, capacitor is said to be short circuited.