Electromagnetic Waves

The magnitude of displacement current depends on:

Which of these is a property of displacement current?

The generalized Ampere's Law is also known as:

If the potential $V$ across a capacitor of $5\, \mu F$ changes at $10\, V/s$, the displacement current is:

A parallel plate capacitor is connected to a special power source that maintains a constant electric field $E$ between the plates. One of the plates is shifted relative to the other such that their overlapping area $A$ increases at a constant rate $\frac{dA}{dt} = \alpha$. What is the magnitude of the displacement current $I_d$ in the region where the plates overlap?

A displacement current of $4.425\ pA$ is produced in a region of space. If the area is $1\ cm^2$, the rate of change of electric field is:

If the electric flux $\Phi_E$ through a closed surface is zero, what can be said about the displacement current through that surface?

Which of the following is the correct expression for the total current density $\vec{J}_{tot}$ in a medium with conductivity $\sigma$ and permittivity $\epsilon$?

A parallel plate capacitor is charged. If a dielectric slab is suddenly inserted between the plates while the capacitor is isolated, the displacement current during the insertion is:

For a charging capacitor, if we double the frequency of the AC source while keeping the voltage amplitude constant, the peak displacement current will:

What is the speed of an electromagnetic wave in a medium of refractive index $n$?

In an EM wave, if the peak electric field is $600$ V/m, what is the peak magnetic field?

Which waves are used to study the crystal structure of solids through diffraction experiments?

What type of wave is used in cellular phone communication?

A $100 \text{ W}$ light bulb converts $5\%$ of its electrical power into visible light. What is the average intensity of visible light at a distance of $1 \text{ m}$ from the bulb?

The displacement current was introduced by Maxwell to resolve an inconsistency in which law?

What is the frequency range of the 'Visible' part of the electromagnetic spectrum?

The pressure exerted by an EM wave of intensity $I$ on a perfectly reflecting surface at normal incidence is $P$. If the frequency of the wave is doubled and the intensity remains the same, the new pressure is:

A radiowave of frequency $3 \text{ MHz}$ passes from vacuum into a medium of refractive index $n=1.5$. The change in its frequency is:

X-rays, Gamma rays, and Ultraviolet rays are all used in medical or industrial applications. Arrange them in decreasing order of their wavelength.

If the electric field vector is $\vec{E}$ and the magnetic field vector is $\vec{B}$ for an EM wave, the value of $\vec{E} \cdot \vec{B}$ is always:

What kind of wavefront is associated with a point source of light at a very large distance?

Which scientist first experimentally proved the existence of electromagnetic waves?

The oscillating electric and magnetic fields in an electromagnetic wave reach their maximum values:

A plane electromagnetic wave travels from vacuum (where the speed of light $c = 3.0 \times 10^8 \text{ m/s}$) into a non-magnetic dielectric medium. The diagram below shows the transition. If the relative permittivity of the medium is $\epsilon_r = 9.0$, what is the ratio of the electric field amplitude to the magnetic field amplitude ($E_0/B_0$) inside the medium?

The concept of displacement current was introduced by Maxwell to remove the inconsistency in:

The direction of the electric field $\vec{E}$, magnetic field $\vec{B}$ and propagation vector $\vec{k}$ in a plane electromagnetic wave are related such that:

For a wave propagating in the $z$-direction, if $\vec{E} = E_0 \sin(kz - \omega t) \hat{i}$, what is the direction of the Poynting vector at $t=0, z=0$?

An EM wave has a wavelength of $10 \text{ m}$. In which region of the spectrum does it lie?

The average intensity of a laser beam is $I$. What is the average energy density?