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JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Introduction and Snapshot of Electromagnetic Waves - Study ref# 827

Introduction: In Chapter 4, we have learnt that an electric current produces magnetic field and that two current-carrying wires exert a magnetic force on each other. Further, in Chapter 6, we have seen that a magnetic field changing wi... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Introduction and Snapshot of Electromagnetic Waves - Study ref# 828

Following sections must be covered to understand the Electromagnetic Wave: 1. Introduction 2. Displacement Current 3. Electromagnetic Waves 4. Electromagnetic Spectrum... read more

JEE-Main - Grade 12 - Physics - Ray Optics and Optical Instruments - Introduction and Snapshot of Ray Optics and Optical Instruments - Study ref# 830

Introduction: Nature has endowed the human eye (retinal) with the sensitivity to detect electromagnetic waves within a small range of the electromagnetic spectrum. Electromagnetic radiation belonging to this region of the spectrum (wav... read more

JEE-Main - Grade 12 - Physics - Dual Nature of Radiation and Matter - Introduction and Snapshot of Dual Nature of Radiation and Matter - Study ref# 836

Introduction: The Maxwell’s equations of electromagnetism and Hertz experiments on the generation and detection of electromagnetic waves in 1887 strongly established the wave nature of light. Towards the same period at the end of 19th ... read more

JEE-Main - Grade 12 - Physics - Communication Systems - Introduction and Snapshot of Communication Systems - Study ref# 849

Following sections must be covered to understand the Communication System: 1. Introduction 2. Elements of a Communication System 3. Basic Terminology Used in Electronic Communication Systems 4. Bandwidth of Signals 5. Bandwidt... read more

JEE-Main - Grade 12 - Physics - Wave Optics - Introduction and Snapshot of Wave Optics - Study ref# 833

Introduction: In 1637 Descartes gave the corpuscular model of light and derived Snell’s law. It explained the laws of reflection and refraction of light at an interface. The corpuscular model predicted that if ray of light (on refracti... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Target Setup for Electromagnetic Waves - Study ref# 829

Student requires to achieve the following milestones to get better grip over Electromagnetic Wave. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapter Te... read more

JEE-Main - Grade 11 - Physics - Waves - Study ref# 1038

Which type of waves do not require a material medium for propagation? Answer: Electromagnetic waves.... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10583

Name the current which can flow even in the absence of electric charge. Answer: Displacement current... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10584

Professor C.V. Raman surprised his students by suspending freely a tiny light ball in a transparent vacuum chamber by shining a laser beam on it, Which property of EM waves was he exhibiting? Give one more examples of this property? Answer: ... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10585

In which directions do the electric and magnetic field vectors oscillate in an electromagnetic wave propagating along the x-axis? Answer: along y-axis andalong z-axis (Alternatively: read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10586

Write the expression for speed of electromagnetic waves in a medium of electrical permittivityand magnetic permeability. Answer: Formula                            Alternatively,                          ... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10587

Do electromagnetic waves carry energy and momentum? Answer: Yes Detailed Answer: EM waves carry energy and momentum without having mass and can exert pressure which is known as radiation pressure. These waves like other waves carry ... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10588

Write the relation for the speed of electromagnetic waves in terms of the amplitudes of electric and magnetic fields. Answer: Speed of electromagnetic wave,  ... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10589

A variable frequency ac source is connected to a capacitor. Will the displacement current change if the frequency of the ac source is decreased? Answer: It is noted that by dropping the variable frequency, there will be drop in displacement ... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10590

A capacitor has been charged by a dc source. What are the magnitude of conduction and displacement currents, when it is fully charged? Answer: The magnitude of conduction and displacement currents are zero. Detailed Answer: When a c... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10591

How does Ampere-Maxwell explain the flow of current through a capacitor when it is being charged by a battery? Write the expression for the displacement current in terms of the rate of change of electric flux. Answer: Explanation of flow of ... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10592

A plane electromagnetic wave of frequency 25 MHz travels in free space along the x=direction. At a particular point in space and time, .What is B at this point? Answer: The magnitude of B is                                            ... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10593

How does a charge q oscillating at certain frequency produce electromagnetic waves? Sketch a schematic diagram depicting electric and magnetic fields for an electromagnetic wave propagating along the Z-direction. Answer: When the motion o... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10594

(i) An EM wave is travelling in a medium with a velocity. Draw a sketch showing the propagation of the EM wave, indicating the direction of the oscillating electric and magnetic fields. (ii) How are the magnitudes of the electric and m... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10595

Why are microwaves considered suitable for radar systems used in aircraft navigation? Answer: Due to their short wavelength Detailed Answer: Microwaves are considered good for radar systems used in aircraft navigation as these wave hav... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10596

Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery. Answer: (a) Ultra violet rays (b) Ultra violet rays/laser... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10597

Name the electromagnetic waves those are widely used as a diagnostic tool in medicine. Answer: X-rays... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10598

To which part of the electromagnetic spectrum does a wave of frequency belong? Answer: Infrared region. Detailed Answer: The frequency belong to infrared region of electromagnetic spe... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10599

Compare the following: (i) Wavelengths of the incident solar radiation absorbed by the earth’s surface and the radiation re-radiated by the earth. (ii) Tanning effect produced on the skin by UV radiation incident directly on the ski... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10600

Identify the electromagnetic waves whose wavelength vary as: (i)   (ii) Write one use for each. Answer: (i) Identification (ii)... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10601

Arrange the following electromagnetic radiations in ascending order to their frequencies: (i) Microwaves (ii) Radio waves (iii) X-rays (iv) Gamma rays Write two uses of any one of these. Answer: Radio waves < Microwaves < X... read more

JEE-Main - Grade 12 - Physics - Electromagnetic Waves - Study ref# 10602

Name the type of EM waves having a wavelength range of 0.1m to 1mm. How are these waves generated? Write their two uses. Answer: Name of EM wave Method of generation Two uses Microwaves Produced by special vacuum tubes Klyston, m... read more

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