Home
Class 12
PHYSICS
A capacitor of capacitance 'C' is being ...

A capacitor of capacitance 'C' is being charged by connecting it across a d.c. source along with an ammeter. Will the ammeter show a momentary deflection during the process of charging ? If so, how would you explain this momentary deflectin and the resulting continuity of current in the circuit ? Write the expression for the current inside the capacitor.

Text Solution

Verified by Experts

Yes, ammeter will show a momentary deflection. The momentary deflection is due to the flow of electrons in the circuit during the charging process. During the charging process the electric field between the capacitor plates is changing and hence a displacement current flows in the gap. Hence we can say that there is a continuity of current in the circuit.
Expression `I_d = epsi_0 (d theta)/(dt)`
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC WAVES

    OSWAAL PUBLICATION|Exercise TOPIC-1 :DISPLACEMENT CURRENT ( LONG ANSWER TYPE QUESTIONS)|1 Videos

  • ELECTROMAGNETIC WAVES

    OSWAAL PUBLICATION|Exercise TOPIC-2 : ELECTROMAGNETIC SPECTRUM (VERY SHORT ANSWER TYPE QUESTIONS)|10 Videos

  • ELECTROMAGNETIC WAVES

    OSWAAL PUBLICATION|Exercise TOPIC-2 : ELECTROMAGNETIC SPECTRUM (SHORT ANSWER TYPE QUESTIONS)|7 Videos

  • ELECTROMAGNETIC INDUCTION

    OSWAAL PUBLICATION|Exercise TOPIC-2 (Eddy Current, Self & Mutual Inductance) (Numerical Problems)|3 Videos

  • ELECTROSTATIC POTENTIAL AND CAPACITANCE

    OSWAAL PUBLICATION|Exercise TOPIC -2 CAPACITORS AND CAPACITANCE (NUMERICAL PROBLEMS)|8 Videos

Similar Questions

Explore conceptually related problems

A capacitor made of two parallel plates each of plate area A and separation d, is being charged by an external a.c. source. Show that the displacement current inside the capacitor is the same as the current charging the capacitor.

A capacitor of capacity 2 muF is charged to a potential difference of 12V. It is then connected across an inductor of 0.6 mH. Current in the circuit at a time when P.D. across the capacitor be 6V is :

A capacitor has been charged by a d.c. source. What are the magnitudes of conduction and displacement currents, when it is fully charged ?

A parallel plate capacitor is being charged by a time varying current. Explain briefly how Ampere's circuital law is generalized to incorporate the effect due to the displacement current.

Figure 8.6 shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in the figure). The charging current is constant and equal to 0.15A. (a) Calculate the capacitance and the rate of change of potential difference between the plates. (b) Obtain the displacement current across the plates. (c) Is Kirchhoff’s first rule (junction rule) valid at each plate of the capacitor? Explain.

A series combination of resistor ( R ), capacitor ( C ) is connected to an .C. source of angular frequency omega . Keeping the voltage same, if the frequency is charged to (omega)/(3) , the current becomes half of the original current. Then the ratio of the capacitive reactance and resistance at the former frequency is

A series LCR circuit is connected to 230 V a.c. source of variable frequency. The inductance of the coil is 5 H capacitance of the capacitor is 5 mu F and resistance is 40 Omega . At resonance calculate , (a) The resonant frequency , (b) current is the circuit and (c ) the inductive reactance.

When an ideal capacitor is charged by a d.c. battery, no current flows. However, when an ac source is used, the current flows continously. How does one explain this, based on the concept of displacement current ?