NCERT Solutions for Class 12 Physics Chapter 8 - Electromagnetic WavesShare
Goprep offers NCERT Physics Part 1 Solutions for Class 12th Chapter 8- Electromagnetic Waves. Providing detailed answers to the questions, these NCERT Solution are based according to the latest official CBSE syllabus which helps students in covering the entire curriculum of the exam in an interesting and easy way. You can access these NCERT Solutions for free of cost.
Gain knowledge on the topics of the Chapter and make your foundation strong by solving the questions which are given at the end of each Chapter of the Physics textbook. Chapter 8 Electromagnetic Waves deals with the important sub-topics which are:
- Displacement Current
- Sources of electromagnetic waves
- Electromagnetic Waves
- Nature of electromagnetic waves
- Electromagnetic Spectrum
- Infrared waves
- Radio waves
- Ultraviolet rays
- Gamma rays
- Visible rays
Find answers to the questions in a well-structured manner and understand the topics in a simple and easy way by using our NCERT Solutions for Class 12th.
NCERT Solutions for Class 12 Physics Chapter 8 - Electromagnetic Waves
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 parallel plate capacitor (Fig. 8.7) 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 s–1.
(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.
The terminology of different parts of the electromagnetic spectrum is given in the text. Use the formula E = hν (for energy of a quantum of radiation: photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation?
In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of 2.0 × 1010 Hz and amplitude 48 V m–1.
(a) What is the wavelength of the wave?
(b) What is the amplitude of the oscillating magnetic field?
(c) Show that the average energy density of the E field equals the average energy density of the B field. [c = 3 × 108 m s–1.]
|Chapter 1 - Electric Charges and Fields|
|Chapter 2 - Electrostatic Potential and Capacitance|
|Chapter 3 - Current Electricity|
|Chapter 4 - Moving Charges and Magnetism|
|Chapter 5 - Magnetism and Matter|
|Chapter 6 - Electromagnetic Induction|
|Chapter 7 - Alternating Current|
|Chapter 8 - Electromagnetic Waves|