Which describes the magnetic field due to the displacement current in a capacitor?

a It is zero as the capacitor is being charged and then is nonzero after the charging is complete.
b It exists as the capacitor is being charged and then is zero after the charging is complete.
c It exists as the capacitor is being charged and then has the same value after the charging is complete.

b It exists as the capacitor is being charged and then is zero after the charging is complete.

Explanation:

The magnetic field due to displacement current is proportional to the displacement current . The magnitude of displacement current is equal to charging current of a capacitor. In the beginning , charging current is maximum but as capacitor is charged gradually , charging current decreases . Ultimately , it becomes zero.

Hence the magnetic field will also become zero in the end.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia