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Physics Part-I
Class 12
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Chapter 1: Electric Charges and Fields
47 questions
2
Chapter 2: Electrostatic Potential and Capacitance
46 questions
3
Chapter 3: Current Electricity
33 questions
4
Chapter 4: Moving Charges and Magnetism
41 questions
5
Chapter 5: Magnetism and Matter
36 questions
6
Chapter 6: Electromagnetic Induction
28 questions
7
Chapter 7: Alternating Current
37 questions
8
Chapter 8: Electromagnetic Waves
20 questions
Q1
Figure 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 Kirchhoffs first rule (junction rule) valid at each plate of the capacitor Explain.
(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 Kirchhoffs first rule (junction rule) valid at each plate of the capacitor Explain.
Q2
A parallel plate capacitor (Fig.) made of circular plates each of radius R = 6.0 cm has a capacitance C = 100 pF. The capacitor is connected to a 230 V ac supply with a (angular) frequency of 300 rad .
View all question(a) What is the rms value of the conduction current?
(b)Is the conduction current equal to the displacement current?
(c)Determine the amplitude of B at a point 3.0 cm from the axis between the plates.
(b)Is the conduction current equal to the displacement current?
(c)Determine the amplitude of B at a point 3.0 cm from the axis between the plates.
Question
Medium
Solving time: 5 mins
Figure 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 Kirchhoffs first rule (junction rule) valid at each plate of the capacitor Explain.
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Chloe Discussed
Figure 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 Kirchhoffs first rule (junction rule) valid at each plate of the capacitor Explain.
(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 Kirchhoffs first rule (junction rule) valid at each plate of the capacitor Explain.
5 mins ago
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Text solution
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(a)
(b)
The displacement current across the plate is same as the conduction current.
Hence, the displacement current ,
(c)
Yes, Kirchhoff's first rule is valid at each plate of the capacitor provided that we take the sum of conduction and displacement for the current.
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Practice more questions from Physics Part-I (NCERT)
Q1
Figure 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 Kirchhoffs first rule (junction rule) valid at each plate of the capacitor Explain.
(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 Kirchhoffs first rule (junction rule) valid at each plate of the capacitor Explain.
Q2
A parallel plate capacitor (Fig.) made of circular plates each of radius R = 6.0 cm has a capacitance C = 100 pF. The capacitor is connected to a 230 V ac supply with a (angular) frequency of 300 rad .
View all(a) What is the rms value of the conduction current?
(b)Is the conduction current equal to the displacement current?
(c)Determine the amplitude of B at a point 3.0 cm from the axis between the plates.
(b)Is the conduction current equal to the displacement current?
(c)Determine the amplitude of B at a point 3.0 cm from the axis between the plates.
Practice questions from Physics Part-I (NCERT)
Question 1
Medium
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About 5% of the power of a 100 W light bulb is converted to visible radiation. What is the average intensity of visible radiation
(a) at a distance of 1m from the bulb?
(b) at a distance of 10 m?
Assume that the radiation is emitted isotropically and neglect reflection.
Question 2
Medium
Views: 6,292
Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs.
(a) 21 cm (wavelength emitted by atomic hydrogen in interstellar space).
(b) 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift).
(c) 2.7 K [temperature associated with the isotropic radiation filling all space thought to be a relic of the big-bang origin of the universe].
(d) [double lines of sodium]
(e) 14.4 ke V [energy of a particular transition in Fe nucleus associated with a famous high resolution spectroscopic method ()].
Question 3
Medium
Views: 6,390
(a) Long distance radio broadcasts use short-wave bands. Why?
(b) It is necessary to use satellites for long distance TV transmission.Why?
(c) Optical and radiotelescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth.Why?
(d) The small ozone layer on top of the stratosphere is crucial for human survival. Why?
(e) If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?
(f) Some scientists have predicted that a global nuclear war on the earth would be followed by a severe nuclear winter with a devastating effect on life on earth. What might be the basis of this prediction?
Practice more questions from Electromagnetic Waves
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| Question Text | Figure 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 Kirchhoffs first rule (junction rule) valid at each plate of the capacitor Explain. |
| Updated On | May 19, 2022 |
| Topic | Electromagnetic Waves |
| Subject | Physics |
| Class | Class 12 |
| Answer Type | Text solution:1 Video solution: 4 |
| Upvotes | 438 |
| Avg. Video Duration | 10 min |
