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महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

Define Capacitive reactance. - Physics

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प्रश्न

Define Capacitive reactance.

व्याख्या
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उत्तर

The effective resistance offered by the capacitor is called capacitive reactance (ΧC).

`Χ_C = 1/omega_C`

`= 1/(2 pi fC)`

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Different Types of AC Circuits: AC Voltage Applied to a Capacitor
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पाठ 13: AC Circuits - Very Short Answer

संबंधित प्रश्‍न

A 2 µF capacitor, 100 Ω resistor and 8 H inductor are connected in series with an AC source.
(i) What should be the frequency of the source such that current drawn in the circuit is maximum? What is this frequency called?
(ii) If the peak value of e.m.f. of the source is 200 V, find the maximum current.
(iii) Draw a graph showing variation of amplitude of circuit current with changing frequency of applied voltage in a series LRC circuit for two different values of resistance R1 and R2 (R1 > R2).
(iv) Define the term 'Sharpness of Resonance'. Under what condition, does a circuit become more selective?


Is energy produced when a transformer steps up the voltage?


A capacitor acts as an infinite resistance for ______.


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A bulb rated 60 W at 220 V is connected across a household supply of alternating voltage of 220 V. Calculate the maximum instantaneous current through the filament.


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


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Of the following about capacitive reactance which is correct?

A capacitor has capacitance C and reactance X, if capacitance and frequency become double, then reactance will be ______.


When an AC voltage of 220 V is applied to the capacitor C ______.

  1. the maximum voltage between plates is 220 V.
  2. the current is in phase with the applied voltage.
  3. the charge on the plates is in phase with the applied voltage.
  4. power delivered to the capacitor is zero.

A device ‘X’ is connected to an a.c source. The variation of voltage, current and power in one complete cycle is shown in figure.

  1. Which curve shows power consumption over a full cycle?
  2. What is the average power consumption over a cycle?
  3. Identify the device ‘X’.


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


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 ______.


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.

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