Electromagnetic Fields interview questions

1. A.the dD/dt term Maxwell added so that a changing electric field produces a magnetic field, which makes wave propagation possible
2. B.the total electric flux through any closed surface equals the enclosed charge divided by the permittivity of free space
3. C.the line integral of magnetic field intensity around a closed path equals the conduction current enclosed plus displacement current
4. D.tangential E and normal D are continuous across a charge-free interface, while normal E jumps by the ratio of the two permittivities

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1. A.Dielectric boundary conditions
2. B.Poisson's equation
3. C.Gauss's law
4. D.Displacement current

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1. A.Gauss's law — the dD/dt term Maxwell added so that a changing electric field produces a magnetic field, which makes wave propagation possible
2. B.Gauss's law — tangential E and normal D are continuous across a charge-free interface, while normal E jumps by the ratio of the two permittivities
3. C.Gauss's law — depth at which current density in a conductor falls to 1/e of its surface value, decreasing with frequency, conductivity and permeability
4. D.Gauss's law — the total electric flux through any closed surface equals the enclosed charge divided by the permittivity of free space

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1. A.Laplacian of electric potential equals minus the charge density divided by permittivity, reducing to Laplace's equation in charge-free regions
2. B.the dD/dt term Maxwell added so that a changing electric field produces a magnetic field, which makes wave propagation possible
3. C.the emf induced in a closed loop equals the negative rate of change of magnetic flux linking that loop
4. D.the line integral of magnetic field intensity around a closed path equals the conduction current enclosed plus displacement current

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1. A.Gauss's law
2. B.Faraday's law of induction
3. C.Dielectric boundary conditions
4. D.Ampere's circuital law

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1. A.Faraday's law of induction — the dD/dt term Maxwell added so that a changing electric field produces a magnetic field, which makes wave propagation possible
2. B.Faraday's law of induction — Laplacian of electric potential equals minus the charge density divided by permittivity, reducing to Laplace's equation in charge-free regions
3. C.Faraday's law of induction — the total electric flux through any closed surface equals the enclosed charge divided by the permittivity of free space
4. D.Faraday's law of induction — the emf induced in a closed loop equals the negative rate of change of magnetic flux linking that loop

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1. A.the emf induced in a closed loop equals the negative rate of change of magnetic flux linking that loop
2. B.depth at which current density in a conductor falls to 1/e of its surface value, decreasing with frequency, conductivity and permeability
3. C.the line integral of magnetic field intensity around a closed path equals the conduction current enclosed plus displacement current
4. D.Laplacian of electric potential equals minus the charge density divided by permittivity, reducing to Laplace's equation in charge-free regions

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1. A.Poisson's equation
2. B.Lenz's law
3. C.Displacement current
4. D.Ampere's circuital law

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1. A.Ampere's circuital law — Laplacian of electric potential equals minus the charge density divided by permittivity, reducing to Laplace's equation in charge-free regions
2. B.Ampere's circuital law — the line integral of magnetic field intensity around a closed path equals the conduction current enclosed plus displacement current
3. C.Ampere's circuital law — tangential E and normal D are continuous across a charge-free interface, while normal E jumps by the ratio of the two permittivities
4. D.Ampere's circuital law — the emf induced in a closed loop equals the negative rate of change of magnetic flux linking that loop

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1. A.tangential E and normal D are continuous across a charge-free interface, while normal E jumps by the ratio of the two permittivities
2. B.the dD/dt term Maxwell added so that a changing electric field produces a magnetic field, which makes wave propagation possible
3. C.magnetic field from a current element is proportional to the current and inversely proportional to the square of the distance, directed by the cross product
4. D.depth at which current density in a conductor falls to 1/e of its surface value, decreasing with frequency, conductivity and permeability

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1. A.Skin depth
2. B.Biot-Savart law
3. C.Lenz's law
4. D.Gauss's law

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1. A.Biot-Savart law — the emf induced in a closed loop equals the negative rate of change of magnetic flux linking that loop
2. B.Biot-Savart law — the line integral of magnetic field intensity around a closed path equals the conduction current enclosed plus displacement current
3. C.Biot-Savart law — magnetic field from a current element is proportional to the current and inversely proportional to the square of the distance, directed by the cross product
4. D.Biot-Savart law — depth at which current density in a conductor falls to 1/e of its surface value, decreasing with frequency, conductivity and permeability

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1. A.the induced current flows in a direction that opposes the change in flux producing it, expressing conservation of energy
2. B.the line integral of magnetic field intensity around a closed path equals the conduction current enclosed plus displacement current
3. C.magnetic field from a current element is proportional to the current and inversely proportional to the square of the distance, directed by the cross product
4. D.the total electric flux through any closed surface equals the enclosed charge divided by the permittivity of free space

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1. A.Dielectric boundary conditions
2. B.Biot-Savart law
3. C.Lenz's law
4. D.Faraday's law of induction

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1. A.Lenz's law — the total electric flux through any closed surface equals the enclosed charge divided by the permittivity of free space
2. B.Lenz's law — the induced current flows in a direction that opposes the change in flux producing it, expressing conservation of energy
3. C.Lenz's law — the emf induced in a closed loop equals the negative rate of change of magnetic flux linking that loop
4. D.Lenz's law — magnetic field from a current element is proportional to the current and inversely proportional to the square of the distance, directed by the cross product

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1. A.the total electric flux through any closed surface equals the enclosed charge divided by the permittivity of free space
2. B.Laplacian of electric potential equals minus the charge density divided by permittivity, reducing to Laplace's equation in charge-free regions
3. C.the emf induced in a closed loop equals the negative rate of change of magnetic flux linking that loop
4. D.the line integral of magnetic field intensity around a closed path equals the conduction current enclosed plus displacement current

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1. A.Ampere's circuital law
2. B.Dielectric boundary conditions
3. C.Biot-Savart law
4. D.Poisson's equation

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1. A.Poisson's equation — magnetic field from a current element is proportional to the current and inversely proportional to the square of the distance, directed by the cross product
2. B.Poisson's equation — Laplacian of electric potential equals minus the charge density divided by permittivity, reducing to Laplace's equation in charge-free regions
3. C.Poisson's equation — the emf induced in a closed loop equals the negative rate of change of magnetic flux linking that loop
4. D.Poisson's equation — depth at which current density in a conductor falls to 1/e of its surface value, decreasing with frequency, conductivity and permeability

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1. A.the line integral of magnetic field intensity around a closed path equals the conduction current enclosed plus displacement current
2. B.the dD/dt term Maxwell added so that a changing electric field produces a magnetic field, which makes wave propagation possible
3. C.depth at which current density in a conductor falls to 1/e of its surface value, decreasing with frequency, conductivity and permeability
4. D.magnetic field from a current element is proportional to the current and inversely proportional to the square of the distance, directed by the cross product

Answer + AI explanation with Pro

1. A.Ampere's circuital law
2. B.Dielectric boundary conditions
3. C.Lenz's law
4. D.Skin depth

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1. A.Skin depth — depth at which current density in a conductor falls to 1/e of its surface value, decreasing with frequency, conductivity and permeability
2. B.Skin depth — the emf induced in a closed loop equals the negative rate of change of magnetic flux linking that loop
3. C.Skin depth — the line integral of magnetic field intensity around a closed path equals the conduction current enclosed plus displacement current
4. D.Skin depth — the induced current flows in a direction that opposes the change in flux producing it, expressing conservation of energy

Answer + AI explanation with Pro

1. A.the induced current flows in a direction that opposes the change in flux producing it, expressing conservation of energy
2. B.the emf induced in a closed loop equals the negative rate of change of magnetic flux linking that loop
3. C.tangential E and normal D are continuous across a charge-free interface, while normal E jumps by the ratio of the two permittivities
4. D.the line integral of magnetic field intensity around a closed path equals the conduction current enclosed plus displacement current

Answer + AI explanation with Pro

1. A.Faraday's law of induction
2. B.Biot-Savart law
3. C.Dielectric boundary conditions
4. D.Displacement current

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1. A.Dielectric boundary conditions — depth at which current density in a conductor falls to 1/e of its surface value, decreasing with frequency, conductivity and permeability
2. B.Dielectric boundary conditions — tangential E and normal D are continuous across a charge-free interface, while normal E jumps by the ratio of the two permittivities
3. C.Dielectric boundary conditions — Laplacian of electric potential equals minus the charge density divided by permittivity, reducing to Laplace's equation in charge-free regions
4. D.Dielectric boundary conditions — the dD/dt term Maxwell added so that a changing electric field produces a magnetic field, which makes wave propagation possible

Answer + AI explanation with Pro

1. A.the dD/dt term Maxwell added so that a changing electric field produces a magnetic field, which makes wave propagation possible
2. B.the induced current flows in a direction that opposes the change in flux producing it, expressing conservation of energy
3. C.Laplacian of electric potential equals minus the charge density divided by permittivity, reducing to Laplace's equation in charge-free regions
4. D.the total electric flux through any closed surface equals the enclosed charge divided by the permittivity of free space

Answer + AI explanation with Pro

1. A.Poisson's equation
2. B.Displacement current
3. C.Skin depth
4. D.Lenz's law

Answer + AI explanation with Pro

1. A.Displacement current — magnetic field from a current element is proportional to the current and inversely proportional to the square of the distance, directed by the cross product
2. B.Displacement current — the induced current flows in a direction that opposes the change in flux producing it, expressing conservation of energy
3. C.Displacement current — the line integral of magnetic field intensity around a closed path equals the conduction current enclosed plus displacement current
4. D.Displacement current — the dD/dt term Maxwell added so that a changing electric field produces a magnetic field, which makes wave propagation possible

Answer + AI explanation with Pro