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Questions and Answers
In 1831, Michael Faraday gave Faraday’s Laws of electromagnetic ______.
In 1831, Michael Faraday gave Faraday’s Laws of electromagnetic ______.
induction
According to Faraday's Law of Electromagnetic Induction, a change in magnetic flux produces an induced ______.
According to Faraday's Law of Electromagnetic Induction, a change in magnetic flux produces an induced ______.
emf
James Clerk Maxwell proposed that a changing electric field can produce a ______ field.
James Clerk Maxwell proposed that a changing electric field can produce a ______ field.
magnetic
Maxwell's idea of displacement current suggests that a changing electric field in a vacuum or free space produces a ______ field.
Maxwell's idea of displacement current suggests that a changing electric field in a vacuum or free space produces a ______ field.
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Displacement current is a current due to changing electric ______ or electric flux.
Displacement current is a current due to changing electric ______ or electric flux.
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The conduction current and displacement current have the property of ______
The conduction current and displacement current have the property of ______
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Displacement current exists only when there is a change in the electric ______.
Displacement current exists only when there is a change in the electric ______.
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Electromagnetic waves are produced by ______ charges.
Electromagnetic waves are produced by ______ charges.
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The direction of oscillations of E and B fields are perpendicular to each other as well as perpendicular to the direction of ______ of waves.
The direction of oscillations of E and B fields are perpendicular to each other as well as perpendicular to the direction of ______ of waves.
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All electromagnetic waves travel in free space with the same ______.
All electromagnetic waves travel in free space with the same ______.
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The amplitude ratio of electric and magnetic field is equal to ______.
The amplitude ratio of electric and magnetic field is equal to ______.
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Electromagnetic waves transport linear ______ as they travel through space.
Electromagnetic waves transport linear ______ as they travel through space.
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The induced Magnetic Field is ______ to Magnetic Field.
The induced Magnetic Field is ______ to Magnetic Field.
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An accelerated charge or ______ charge particle produces electromagnetic waves.
An accelerated charge or ______ charge particle produces electromagnetic waves.
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Oscillating electric fields produce an oscillating ______ field.
Oscillating electric fields produce an oscillating ______ field.
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Electric and magnetic fields in an electromagnetic wave are in the same ______.
Electric and magnetic fields in an electromagnetic wave are in the same ______.
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Electromagnetic waves are ______ in nature.
Electromagnetic waves are ______ in nature.
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Electromagnetic waves propagate through oscillations of ______ and magnetic fields.
Electromagnetic waves propagate through oscillations of ______ and magnetic fields.
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In an electromagnetic wave, the electric and magnetic fields are perpendicular to each other and also perpendicular to the direction of wave ______.
In an electromagnetic wave, the electric and magnetic fields are perpendicular to each other and also perpendicular to the direction of wave ______.
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Electromagnetic waves are radiated by an ______ or oscillating charge particle.
Electromagnetic waves are radiated by an ______ or oscillating charge particle.
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The oscillation of electric and magnetic fields occurs perpendicular to the direction of wave ______.
The oscillation of electric and magnetic fields occurs perpendicular to the direction of wave ______.
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The energy of Electric Field is from ______.
The energy of Electric Field is from ______.
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The energy of Magnetic Field is from ______.
The energy of Magnetic Field is from ______.
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The symbol for energy density of Electric Field is ______.
The symbol for energy density of Electric Field is ______.
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The symbol for energy density of Magnetic Field is ______.
The symbol for energy density of Magnetic Field is ______.
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The number of turns per unit length is denoted by ______.
The number of turns per unit length is denoted by ______.
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The formula for average energy density is 𝝁𝒂𝒗𝒈 = 𝜺𝒐𝑬𝒐𝟐 = 𝑩𝒐𝟐 / ______
The formula for average energy density is 𝝁𝒂𝒗𝒈 = 𝜺𝒐𝑬𝒐𝟐 = 𝑩𝒐𝟐 / ______
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The average energy density of the Electric Field (𝝁𝑬)𝒂𝒗𝒈 is equal to ______.
The average energy density of the Electric Field (𝝁𝑬)𝒂𝒗𝒈 is equal to ______.
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The average energy density of the Magnetic Field (𝝁𝑩)𝒂𝒗𝒈 is equal to ______.
The average energy density of the Magnetic Field (𝝁𝑩)𝒂𝒗𝒈 is equal to ______.
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The energy crossing per unit time in a direction perpendicular to the direction of propagation is called ______.
The energy crossing per unit time in a direction perpendicular to the direction of propagation is called ______.
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The total energy density in an electromagnetic wave is equal to the sum of the energy density of the electric field and the ______.
The total energy density in an electromagnetic wave is equal to the sum of the energy density of the electric field and the ______.
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The electric field in a plane electromagnetic wave is given by Ey=2sin(0.5x 10^3 𝒙+1.5x10^11 t) j. The direction of propagation is a key characteristic of the ______.
The electric field in a plane electromagnetic wave is given by Ey=2sin(0.5x 10^3 𝒙+1.5x10^11 t) j. The direction of propagation is a key characteristic of the ______.
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The speed of a wave can be calculated from its given equation, where in this case the electric field is given by Ey=2sin(0.5x 10^3 𝒙+1.5x10^11 t) j, and this indicates the wave's ______.
The speed of a wave can be calculated from its given equation, where in this case the electric field is given by Ey=2sin(0.5x 10^3 𝒙+1.5x10^11 t) j, and this indicates the wave's ______.
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The magnetic field in a plane electromagnetic wave is given by Bz=2x10^-7 sin(0.5 x 10^3x +1.5 x 10^11 t)tesla. From this, one can derive an expression for the electric ______.
The magnetic field in a plane electromagnetic wave is given by Bz=2x10^-7 sin(0.5 x 10^3x +1.5 x 10^11 t)tesla. From this, one can derive an expression for the electric ______.
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In an electromagnetic wave, the peak values of the electric field (Eo) and the magnetic field (Bo) are related, and these relationships are usually calculated using the ______ of the wave equations.
In an electromagnetic wave, the peak values of the electric field (Eo) and the magnetic field (Bo) are related, and these relationships are usually calculated using the ______ of the wave equations.
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The speed of electromagnetic waves in a medium is affected by the medium's properties such as its dielectric constant (K) and relative permeability (μr), altering the ______ from its value in vacuum.
The speed of electromagnetic waves in a medium is affected by the medium's properties such as its dielectric constant (K) and relative permeability (μr), altering the ______ from its value in vacuum.
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If c denotes the speed of electromagnetic waves in vacuum, then its speed in a different medium is given by 𝒗= 𝒄/ square root ______
If c denotes the speed of electromagnetic waves in vacuum, then its speed in a different medium is given by 𝒗= 𝒄/ square root ______
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A plane electromagnetic wave Ez=100cos(6x10^8t +4x) V/m propagates in a non-magnetic medium, whose dielectric constant can be calculated based on how the wave is ______.
A plane electromagnetic wave Ez=100cos(6x10^8t +4x) V/m propagates in a non-magnetic medium, whose dielectric constant can be calculated based on how the wave is ______.
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Electromagnetic waves carry ______ as they travel through space, and this energy is contained in oscillating electric and magnetic fields.
Electromagnetic waves carry ______ as they travel through space, and this energy is contained in oscillating electric and magnetic fields.
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Electromagnetic waves carry energy, and an equal amount is contributed by both the electric and the magnetic ______.
Electromagnetic waves carry energy, and an equal amount is contributed by both the electric and the magnetic ______.
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Electromagnetic waves are produced by an oscillating charge in a[n] ______ circuit.
Electromagnetic waves are produced by an oscillating charge in a[n] ______ circuit.
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Study Notes
Electromagnetic Waves Lecture Notes
- Electromagnetic waves are produced by accelerated charges
- They do not require a medium for propagation
- Oscillations of the electric and magnetic fields are perpendicular to each other and to the direction of propagation
- The amplitude ratio of the electric and magnetic fields is a constant (Eo/Bo = c)
- Electromagnetic waves carry energy as they travel through space
- This energy is shared equally by the electric and magnetic fields
- The average energy density of an electromagnetic wave is the same for both the electric and magnetic fields
Properties of Electromagnetic Waves
- They are transverse waves
- They obey the principle of superposition
- They exhibit properties like reflection, refraction, interference, diffraction, and polarization
Electromagnetic Spectrum
- An orderly distribution of electromagnetic waves based on their wavelengths or frequencies
- The different bands have varying properties
- Examples include gamma rays, X-rays, ultraviolet light, visible light, infrared waves, microwaves, and radio waves.
Energy Density of Electromagnetic Waves
- Electromagnetic waves carry energy as they travel through space
- The energy is contained in oscillating electric and magnetic fields
- Equal amounts of energy are contributed by the electric and magnetic fields to the total energy
- Energy density of an electromagnetic wave is given by the average sum of energy density of electric field (Ue) and magnetic field (Um)
Intensity of an Electromagnetic Wave
- The rate at which energy is transported per unit area is called intensity
- Intensity is equal to average energy density multiplied by velocity (c)= I = <U>avg x c
Momentum of Electromagnetic Waves
- Electromagnetic waves transport linear momentum
- The momentum is given by P = U/c
Pointing Vector
- A vector that represents the direction of energy flow per unit area and time
- It is given by S = (1/μ0) (E x B)
Summary of Maxwell's Equations
- Gauss's Law for Electricity: ΦE = Qenclosed/ε0
- Gauss's Law for Magnetism: ΦB = 0
- Faraday's Law of Induction: ∮E·dl = -dΦB/dt
- Ampère-Maxwell Law: ∮B·dl = μ0(i + ε0dΦE/dt)
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Description
This quiz covers the essential properties and characteristics of electromagnetic waves. It discusses their production, propagation, and the various phenomena they exhibit, such as reflection and refraction. Dive into the fascinating world of the electromagnetic spectrum and enhance your understanding of this fundamental topic in physics.
