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Ashok0210

Asked: March 21, 2021In: Class 12 Physics

A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?

Class 12 Physics CBSE and UP Board Electromagnetic Waves Chapter-8 Exercise 8.4 NCERT Solutions for Class 12 Physics Chapter 8 Question 4

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

What physical quantity is the same for X-rays of wavelength 10⁻¹⁰ m, red light of wavelength 6800 A and radio waves of wavelength 500 m?

Class 12 Physics CBSE and UP Board Electromagnetic Waves Chapter-8 Exercise 8.3 NCERT Solutions for Class 12 Physics Chapter 8 Question 3

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

A parallel plate capacitor (Fig. 8.7) made of circular plates each of radius R = 6.0 cm has a capacitance C=100pF.The capacitor is connected to a 230 V ac supply with a (angular) frequency of 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.

Class 12 Physics CBSE and UP Board Electromagnetic Waves Chapter-8 Exercise 8.2 NCERT Solutions for Class 12 Physics Chapter 8 Question 2

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

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 0.15 A. (a) Calculate the capacitance and the rate of charge 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.

Class 12 Physics CBSE and UP Board Electromagnetic Waves Chapter-8 Exercise 8.1 NCERT Solutions for Class 12 Physics Chapter 8 Question 1

Ashok0210

Asked: March 21, 2021In: Class 12 Physics

Answer the following questions: (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 radio telescopes 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? (e) 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?

Class 12 Physics CBSE and UP Board Electromagnetic Waves Chapter-8 Exercise 8.15 NCERT Solutions for Class 12 Physics Chapter 8 Question 15 Additional Exercise

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