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#1 Class 12 Physics Electromagnetic Waves 2023 Short 3M CBSE

The magnetic field in a plane electromagnetic wave is given by $B = (200\ \mu\text{T})\sin[(4.0 \times 10^{15}\text{ s}^{-1})(t - x/c)]$. Find: (a) the maximum electric field, (b) the average energy density of the ele...

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#2 Class 12 Physics Electromagnetic Waves 2022 Short 2M CBSE

In an electromagnetic wave in free space, the rms value of the electric field is $E_{rms} = 6$ V/m. Find the peak value of the magnetic field.

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#3 Class 12 Physics Electromagnetic Waves 2021 Mcq 1M CBSE

The electric field of an EM wave in a medium is: $E_x = 0$, $E_y = 2.5\cos[(2\pi \times 10^6)t - (\pi \times 10^{-2})x]$ N/C, $E_z = 0$. The wave is

A. Moving along $y$-direction with frequency $2\pi \times 10^6$ Hz and wavelength 200 m

B. Moving along $x$-direction with frequency $10^6$ Hz and wavelength 100 m

C. Moving along $x$-direction with frequency $10^6$ Hz and wavelength 200 m

D. Moving along $-x$ direction with frequency $10^6$ Hz and wavelength 200 m

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#4 Class 12 Physics Electromagnetic Waves 2022 Short 3M CBSE

A 100 $\Omega$ resistance and a capacitor of 100 $\Omega$ reactance are connected in series across a 220 V source. When the capacitor is 50% charged, find the peak value of the displacement current.

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#5 Class 12 Physics Electromagnetic Waves 2019 Short 2M CBSE

A capacitor has been charged by a DC source. What are the magnitudes of conduction current and displacement current when it is fully charged?

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#6 Class 12 Physics Electromagnetic Waves 2020 Short 2M CBSE

The voltage between the plates of a parallel-plate capacitor of capacitance 1 $\mu$F is changing at the rate of 5 V/s. What is the displacement current in the capacitor?

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#7 Class 12 Physics Electromagnetic Waves 2021 Mcq 1M CBSE

Which electromagnetic waves are known as 'heat waves'?

A. UV rays

B. IR rays

C. X-rays

D. Gamma rays

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#8 Class 12 Physics Electromagnetic Waves 2020 Mcq 1M CBSE

Welders wear special glass goggles or face masks to protect their eyes from

A. UV rays

B. X-rays

C. IR rays

D. Gamma rays

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#9 Class 12 Physics Electromagnetic Waves 2021 Short 3M CBSE

Electromagnetic waves with wavelengths (i) $\lambda_1$ used in radar for aircraft navigation, (ii) $\lambda_2$ used to kill germs in water purifiers, (iii) $\lambda_3$ used to improve visibility in fog and mist. Ident...

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#10 Class 12 Physics Electromagnetic Waves 2022 Short 3M CBSE

The amplitude of the magnetic field of a plane electromagnetic wave propagating along the positive x-axis in vacuum is $B_0 = 510$ nT and its angular frequency is $\omega = 6.0 \times 10^7$ rad/s. Write the expression...

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#11 Class 12 Physics Electromagnetic Waves 2023 Short 3M CBSE

A capacitor made of two parallel plates each of area $A$ and separation $d$ is being charged by an external AC source. Show that the displacement current inside the capacitor is the same as the current charging the ca...

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#12 Class 12 Physics Electromagnetic Waves 2021 Short 2M CBSE

What is displacement current? Why was this concept introduced by Maxwell?

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#13 Class 12 Physics Electromagnetic Waves 2022 Short 3M CBSE

State Maxwell's four equations (Maxwell's equations).

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#14 Class 12 Physics Electromagnetic Waves 2023 Long 5M CBSE

How are electromagnetic waves produced? What is the source of energy of these waves? Write mathematical expressions for $\vec{E}$ and $\vec{B}$ of an EM wave propagating along the z-axis. Write any two important prope...

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#15 Class 12 Physics Electromagnetic Waves 2022 Short 2M CBSE

Write an expression for the momentum carried by an electromagnetic wave. How do you establish that EM waves carry energy and momentum?

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#16 Class 12 Physics Electromagnetic Waves 2021 Short 2M CBSE

The speed of an electromagnetic wave in a material medium is given by $v = \frac{1}{\sqrt{\mu\epsilon}}$, where $\mu$ is the permeability and $\epsilon$ is the permittivity. How does the frequency change when the wave...

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#17 Class 12 Physics Electromagnetic Waves 2020 Short 2M CBSE

Arrange the following electromagnetic waves in descending order of their wavelength: (1) Microwaves, (2) Infrared rays, (3) Ultraviolet radiation, (4) Gamma rays.

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#18 Class 12 Physics Electromagnetic Waves 2019 Short 1M CBSE

Name the physical quantity that remains the same for microwaves of wavelength 1 mm and UV radiation of wavelength 1600 Å in vacuum.

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#19 Class 12 Physics Electromagnetic Waves 2021 Mcq 1M CBSE

Which of the following statements is NOT true about the properties of electromagnetic waves?

A. These waves do not require any material medium for propagation

B. Both $\vec{E}$ and $\vec{B}$ attain their maxima and minima at the same time

C. The energy in an EM wave is divided equally between electric and magnetic fields

D. Both $\vec{E}$ and $\vec{B}$ are parallel to each other

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#20 Class 12 Physics Electromagnetic Waves 2020 Mcq 1M CBSE

In a diagram showing $\vec{E}$ (upward) and $\vec{B}$ (to the right) of an electromagnetic wave, the direction of propagation is

A. perpendicular to $\vec{E}$ and $\vec{B}$, out of the plane of paper

B. perpendicular to $\vec{E}$ and $\vec{B}$, into the plane of paper

C. parallel and in the same direction as $\vec{E}$

D. parallel and in the same direction as $\vec{B}$

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