Chapter 34, Problem 34.1QQ

(i)

To determine

The current present in the region of space between the plates of the capacitor during the discharging of the $RC$ circuit.

Answer to Problem 34.1QQ

Option (b) displacement current but no conduction current.

Explanation of Solution

During the discharging of $RC$ circuit, the capacitor contains displacement current. There is no conduction current, because there is no conductor between the plates. Due to the decreasing charge on the plates between the plates a time varying electric field is present. The displacement current is represented by the time varying electric flux.

Conclusion:

Since, the displacement current is represented by the time varying electric flux and there is no conductor between the plates. Thus, option (b) is correct.

As there is no conductor presents between the capacitor plates, there is no conduction current but the displacement current is present. Thus, option (a) is incorrect.

The displacement current is present but the conduction current is not presents between the plates so it is impossible to present both the currents between the plates. Thus, option (c) is incorrect.

As there is displacement current is present between the plates so it is not correct that there is no current of any type. Thus option (d) is incorrect.

(ii)

To determine

The field present in the region of space between the plates of the capacitor during the discharging of the $RC$ circuit.

Answer to Problem 34.1QQ

Option (c) both the electric field and magnetic field.

Explanation of Solution

When a capacitor is fully charged after opening the circuit, after some time it starts to discharge. Due to the discharging of the capacitor there is only electric field is present.

After the some time when the discharging of the capacitor plates take place, the charge particle starts to move from one plate to another plate. This movement of the charge particle creates a magnetic field at the plate. So after discharge of a capacitor plate there is both electric and magnetic fields are present.

Conclusion:

Since, after the discharging of the capacitor plate there is electric field and magnetic field both are present. Thus, option (c) is correct.

As the magnetic field is also present with the electric field then there is no scope that there is no magnetic field. Thus, option (a) is incorrect.

As the electric field is present with the magnetic field then there is no scope that there is no electric field. Thus, option (b) is incorrect.

As the electric field and the magnetic field both are present it is not possible that there is a absence of any field. Thus, option (d) is incorrect.