मराठी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान इयत्ता ११

When an Ac Source is Connected to a Capacitor, There is a Steady-state Current in the Circuit. Does It Mean that the Charges Jump from One Plate to the Other to Complete the Circuit? - Physics

Advertisements
Advertisements

प्रश्न

When an AC source is connected to a capacitor, there is a steady-state current in the circuit. Does it mean that the charges jump from one plate to the other to complete the circuit?

टीपा लिहा

उत्तर

No. When an AC source is connected to a capacitor, there is a steady in the circuit to transfer change to the plates of the capacitor. This produces a potential difference between the plates. The capacitance is alternatively charged and discharged as the current reverses after each half cycle.

shaalaa.com
Different Types of AC Circuits: AC Voltage Applied to a Capacitor
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 17: Alternating Current - Short Answers [पृष्ठ ३२८]

APPEARS IN

एचसी वर्मा Concepts of Physics Vol. 2 [English] Class 11 and 12
पाठ 17 Alternating Current
Short Answers | Q 8 | पृष्ठ ३२८

संबंधित प्रश्‍न

Show that the current leads the voltage in phase by π/2 in an AC circuit containing an ideal capacitor ?


A current i1 = i0 sin ωt passes through a resistor of resistance R. How much thermal energy is produced in one time period? A current i2 = −i0 sin ωt passes through the resistor. How much thermal energy is produced in one time period? If i1 and i2 both pass through the resistor simultaneously, how much thermal energy is produced? Is the principle of superposition obeyed in this case?


A capacitor acts as an infinite resistance for ______.


An AC source producing emf ε = ε0 [cos (100 π s−1)t + cos (500 π s−1)t] is connected in series with a capacitor and a resistor. The steady-state current in the circuit is found to be i1 cos [(100 π s−1)t + φ1) + i2 cos [(500π s−1)t + ϕ2]. So,


The peak voltage of a 220 V AC source is


The dielectric strength of air is 3.0 × 106 V/m. A parallel-plate air-capacitor has area 20 cm2 and plate separation 0.10 mm. Find the maximum rms voltage of an AC source that can be safely connected to this capacitor.


A device Y is connected across an AC source of emf e = e0 sin ωt. The current through Y is given as i = i0 sin (ωt + π/2).

  1. Identify the device Y and write the expression for its reactance.
  2. Draw graphs showing a variation of emf and current with time over one cycle of AC for Y.
  3. How does the reactance of the device Y vary with the frequency of the AC? Show graphically.
  4. Draw the phasor diagram for device Y.

If circuit containing capacitance only, the current ______.


When an ac voltage of 220 V is applied to the capacitor C, then ______.


The frequency of A.C. mains in India is ______.

Of the following about capacitive reactance which is correct?

Explain why the reactance provided by a capacitor to an alternating current decreases with increasing frequency.


In the LCR circuit shown in figure, the ac driving voltage is v = vm sin ωt.

  1. Write down the equation of motion for q (t).
  2. At t = t0, the voltage source stops and R is short circuited. Now write down how much energy is stored in each of L and C.
  3. Describe subsequent motion of charges.


Define Capacitive reactance.


An iron cored coil is connected in series with an electric bulb with an AC source as shown in figure. When iron piece is taken out of the coil, the brightness of the bulb will ______.


An a.c. source generating a voltage ε = ε0 sin ωt is connected to a capacitor of capacitance C. Find the expression for the current I flowing through it. Plot a graph of ε and I versus ωt to show that the current is ahead of the voltage by π/2.


A resistor of 50 Ω, a capacitor of `(25/pi)` µF and an inductor of `(4/pi)` H are connected in series across an ac source whose voltage (in volts) is given by V = 70 sin (100 πt). Calculate:

  1. the net reactance of the circuit
  2. the impedance of the circuit
  3. the effective value of current in the circuit.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×