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A lamp is connected in series with a capacitor. Predict your o
Physics Part-I
Physics Part-I

Class 12

NCERT

Publisher:
NCERT
Subject:
Physics
1

Chapter 1: Electric Charges and Fields

47 questions

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2

Chapter 2: Electrostatic Potential and Capacitance

46 questions

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3

Chapter 3: Current Electricity

33 questions

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4

Chapter 4: Moving Charges and Magnetism

41 questions

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5

Chapter 5: Magnetism and Matter

36 questions

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6

Chapter 6: Electromagnetic Induction

28 questions

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7

Chapter 7: Alternating Current

37 questions

Q1
A pure inductor of is connected to a source of . Find the inductive reactance and rms current in the circuit if the frequency of the source is .
Q2
A lamp is connected in series with a capacitor. Predict your observations for dc and ac connections. What happens in each case if the capacitance of the capacitor is reduced?
Q3
A capacitor is connected to a source. Find the capacitive reactance and the current (rms and peak) in the circuit. If the frequency is doubled, what happens to the capacitive reactance and the current?
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8

Chapter 8: Electromagnetic Waves

20 questions

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Question
Medium
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Solving time: 3 mins

A lamp is connected in series with a capacitor. Predict your observations for dc and ac connections. What happens in each case if the capacitance of the capacitor is reduced?

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Updated on: Feb 12, 2024

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Book:

Physics Part-I (NCERT)

Text SolutionText solutionverified iconVerified

When a dc source is connected to a capacitor, the capacitor gets charged and after charging no current flows in the circuit and the lamp will not glow. There will be no change even if is reduced. With ac source, the capacitor offers capacitative reactance and the current flows in the circuit. Consequently, the lamp will shine. Reducing will increase reactance and the lamp will shine less brightly than before.
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Practice more questions from Physics Part-I (NCERT)

Q1
A pure inductor of is connected to a source of . Find the inductive reactance and rms current in the circuit if the frequency of the source is .
Q2
A lamp is connected in series with a capacitor. Predict your observations for dc and ac connections. What happens in each case if the capacitance of the capacitor is reduced?
Q3
A capacitor is connected to a source. Find the capacitive reactance and the current (rms and peak) in the circuit. If the frequency is doubled, what happens to the capacitive reactance and the current?
View all

Practice questions from Physics Part-I (NCERT)

Question 1
Medium
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(a) For circuits used for transporting electric power, a low power factor implies large power loss in transmission. Explain. (b) Power factor can often be improved by the use of a capacitor of appropriate capacitance in the circuit. Explain.
Topic

Topic:

Alternating Current

Book

Book:

Physics Part-I (NCERT)

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Question 2
Easy
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A 100  resistor is connected to a 220 V, 50 Hz ac supply.(a) What is the rms value of current in the circuit?

(b) What is the net
power consumed over a full cycle?

Topic

Topic:

Alternating Current

Book

Book:

Physics Part-I (NCERT)

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Question 3
Hard
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An LC circuit contains a 20 mH inductor and a 50 F capacitor with an initial charge of 10 mC. The resistance of the circuit is negligible. Let the instant the circuit is closed be t = 0.(a) What is the total energy stored initially? Is it conserved during LC oscillations?

(b) What is the natural frequency of the
circuit?

(c) At what time is  the energy stored 

     (i) completely electrical (i.e., stored in the capacitor)? 

     (ii) completely magnetic (i.e. stored in the inductor)?

(d) At what times is the total energy shared
equally between the inductor and the capacitor?

(e) If a resistor is inserted in the circuit,

how much energy is eventually dissipated as heat?

Topic

Topic:

Alternating Current

Book

Book:

Physics Part-I (NCERT)

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Question 4
Easy
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A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. What should be the number of turns in the secondary in order to get output power at 230 V?
Topic

Topic:

Alternating Current

Book

Book:

Physics Part-I (NCERT)

View 2 solutions

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Practice more questions from Alternating Current

Question 1
Medium
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Views: 6,034

The voltage of an ac supply varies with time as . The maximum voltage and frequency respectively are:
Topic

Topic:

Alternating Current

Book

Book:

Fundamentals of Physics, Extended

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Question 2
Easy
Views

Views: 5,787

In a series circuit and the voltage and the frequency of the main supply is and , respectively. On taking out the capacitance from the circuit, the current lags behind the voltage by . On taking out the inductor from the circuit, the current leads the voltage by . The power dissipated in the circuit is
(a)
(b)
(c) zero
(d)
Topic

Topic:

Alternating Current

Book

Book:

Arihant Physics JEE Main Chapterwise Solutions (2019-2002) (Arihant)

Exam

Exam:

JEE Mains 2010

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Question 3
Hard
Views

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In series circuit, the resistance, inductive reactance and capacitive reactance are and respectively. The impedance of the circuit is
Topic

Topic:

Alternating Current

Book

Book:

Master Resource Book in JEE Main Physics (Arihant)

View 4 solutions

Question 4
Hard
Views

Views: 6,009

In the given circuit, the source has . Considering the inductor and capacitor to be ideal, the correct choice(s) is(are)
  1. the current through the circuit, is approximately
  2. the current through the circuit, is approximately
  3. the voltage across resistor
  4. the voltage across resistor
Topic

Topic:

Alternating Current

Exam

Exam:

JEE Advanced 2012

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Practice questions on similar concepts asked by Filo students

Question 1
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Question 2
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Question Text
A lamp is connected in series with a capacitor. Predict your observations for dc and ac connections. What happens in each case if the capacitance of the capacitor is reduced?
Updated OnFeb 12, 2024
TopicAlternating Current
SubjectPhysics
ClassClass 12
Answer TypeText solution:1 Video solution: 4
Upvotes402
Avg. Video Duration5 min