Concept:A capacitor blocks steady direct current because its plates are separated by an insulating material that prevents charge flow.
Explanation:In a parallel plate capacitor, the two plates are made of a conducting material.
Between these plates lies a dielectric, which is an insulating substance such as glass, mica, or air.
For a direct current to pass through a circuit, there must be a continuous path for charge carriers to move.
However, the dielectric between the plates does not allow free electrons or ions to flow through it.
When a DC voltage is applied, the capacitor charges momentarily as electrons accumulate on one plate and leave the other.
Once fully charged, no further current flows because the insulating dielectric blocks any continuous movement of charge across the gap.
Thus, a steady direct current cannot pass through a parallel plate capacitor due to the non-conducting nature of the dielectric.
Answer:B. The dielectric between the plates is non-conducting.