EMFT

What does Maxwell's first equation, also known as Gauss's law for electricity, state?

• The electric flux through a closed surface is proportional to the charge enclosed

• The magnetic flux through a closed surface is proportional to the current enclosed

• The electric field around a closed loop is zero

• The magnetic field around a closed loop is zero

What does Maxwell's second equation, also known as Gauss's law for magnetism, state?

• The electric flux through a closed surface is proportional to the charge enclosed

• The magnetic flux through a closed surface is proportional to the current enclosed

• The electric field around a closed loop is zero

• The magnetic field around a closed loop is zero

What is Faraday's law of electromagnetic induction?

• The induced electromotive force in any closed circuit is equal to the rate of change of the magnetic flux through the circuit

• The induced electromotive force in any closed circuit is equal to the magnetic flux through the circuit

• The induced electromotive force in any closed circuit is equal to the charge enclosed

• The induced electromotive force in any closed circuit is equal to the current enclosed

What is Ampère's law in magnetostatics?

• The line integral of the magnetic field around a closed loop is proportional to the current enclosed by the loop

• The line integral of the electric field around a closed loop is proportional to the charge enclosed by the loop

• The line integral of the magnetic field around a closed loop is zero

• The line integral of the electric field around a closed loop is zero

Ampère's law with Maxwell's addition states that:

• The magnetic flux through a closed surface is zero

• The electric flux through a closed surface is zero

• The circulation of the magnetic field around a closed loop is proportional to the sum of the conduction current and displacement current through the loop

• The circulation of the electric field around a closed loop is zero

The Poynting vector represents

• The rate of energy transfer per unit area in an electromagnetic wave

• The magnetic field intensity

• The electric potential

• The charge density

In an electromagnetic wave, the electric and magnetic fields are:

• Perpendicular to each other and perpendicular to the direction of wave propagation

• Perpendicular to each other and perpendicular to the direction of wave propagation

• Perpendicular to each other and parallel to the direction of wave propagation

• Parallel to each other and perpendicular to the direction of wave propagation

Which of the following is true about electromagnetic waves in free space?

• They require a medium to propagate

• They propagate at the speed of sound

• They consist of oscillating electric and magnetic fields that are in phase

• They consist of oscillating electric and magnetic fields that are 90 degrees out of phase

What is the physical significance of the divergence of the electric field (∇⋅E) in Maxwell's equations?

• It represents the change in magnetic flux

• It represents the presence of electric charge density

• It represents the circulation of the electric field

• It represents the energy stored in the electric field

Which of the following describes the displacement current in Maxwell's equations?

• It is a fictitious current that accounts for the changing electric field in Ampère's law

• It is the actual current flowing through a conductor

• It is the current associated with the magnetic monopoles

• It is the current due to the motion of free electrons in a vacuum