The formula for displacement $\left( I _d\right)$ is :
- A$\mu_0 \frac{d \phi_{ E }}{d t}$
- B$\mu_0 \in_0 \frac{d \phi_{ E }}{d t}$
- ✓$\in_0 \frac{d \phi_{ E }}{d t}$
- D$\frac{1}{\in_0} \frac{d \phi_{ E }}{d t}$
Answer: C.
View full solution →Question types
Electromagnetic Waves question types
126 questions across 7 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
126
Questions
7
Question groups
5
Question types
01
M.C.Q [1M]
26 Q→021 Marks Question
47 Q→03Short Answer Type Questions [2M]
8 Q→043 Marks Question
21 Q→054 Marks Questions
2 Q→06Long Answer Type Questions [5M]
10 Q→07Fill in the blanks.[1M]
12 Q→Sample Questions
Electromagnetic Waves questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
In any electromagnetic wave, electric and magnetic field are represented by $\vec{E}$ and $\vec{B}$ respectively. The direction of propagation of this wave is along :
- A$\overrightarrow{ B }$
- B$\overrightarrow{ E }$
- ✓$\vec{E} \times \vec{B}$
- D$\vec{B} \times \vec{E}$
Answer: C.
View full solution →Main source of electromagnetic waves is:
- AStationary charge
- BCharge moving with uniform speed
- ✓Accelerated charge
- DNone of the above
Answer: C.
View full solution →Out of the following, which colour's wavelength is more than the wavelength of yellow colour?
- AGreen
- BBlue
- ✓Red
- DViolet
Answer: C.
View full solution →Out of the following, the one whose frequency is minimum is:
- ✓Infrared rays
- BX-rays
- CUltra-violet rays
- DGamma rays
Answer: A.
View full solution →Write the name of any three waves (radiations) produced in the electromanetic spectrum.
A charged particle oscillates about its mean equilibrium position with a frequency of $10^9 Hz$. What is the frequency of the electromagnetic waves produced by the oscillator?
View full solution →What physical quantity is the same for X-rays of wavelength $10^{-10} m$, red light of wavelength 6800 Å and radio-waves of wavelength 500 m?
View full solution →Obtain ratio of speed between lights of wavelength 5000 À and 8000 A in vacuum.
In long range transmission, why micro waves are better carrier than radio waves?
The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is $B _0$$=510 nT$. What is the amplitude of the electric field part of the wave?
View full solution →A radio can tune in to any station in the 7.5 MHz to 12 MHz band. What is the corresponding wavelength band?
A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?
When does a charge be source of origin of electromagnetic waves? How are the magnetic field and electric field mutually and with the transmission of wave related? Which physical quantity is same for waves of all parts of electromagnetic classification?
Write Maxwell's equations.
(a) Which of the following can be a source for origin of electromagnetic waves? Give reason.
(i) A charge moving with constant speed
(ii) Charge undergoing circular motion
(iii) Fixed charge.
(b) Name that part of electromagnetic spectrum with which waves of frequency
(i) $10^{20} Hz$,
(ii) $10^9 Hz$ associated.
View full solution →(i) A charge moving with constant speed
(ii) Charge undergoing circular motion
(iii) Fixed charge.
(b) Name that part of electromagnetic spectrum with which waves of frequency
(i) $10^{20} Hz$,
(ii) $10^9 Hz$ associated.
Arrange electromagnetic radiations in the ascending order of their frequencies. Write uses of any one of them-Micro waves, Radio waves, X-rays, gamma rays.
Explain frequency and wavelength of electromagnetic spectrum.
Write some properties of electromagnetic waves.
How does Maxwell modify Ampere's circuital law? Explain.
In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of $2.0 \times 10^{10} Hz$ and amplitude $48 V m ^{-1}$.
(a) What is the wavelength of the wave?
(b) What is the amplitude of the oscillating magnetic field?
(c) Show that the average energy density of the E field equals the average energy density of the B field $\left[ c =3 \times 10^8 m s ^{-1}\right]$.
View full solution →(a) What is the wavelength of the wave?
(b) What is the amplitude of the oscillating magnetic field?
(c) Show that the average energy density of the E field equals the average energy density of the B field $\left[ c =3 \times 10^8 m s ^{-1}\right]$.
Write one-one use of the following waves: (i) Micro waves (ii) Infrared waves (iii) Ultraviolet waves (iv) Radio waves
The terminology of different parts of the electromagnetic spectrum is given in the text. Use the formula E = hv (for energy of a quantum of radiation : photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation?
Suppose that the electric field amplitude of an electromagnetic wave is $E_0=120 N / C$ and that its frequency is v = 50.0MHz
(a) Determine,$B _0, \omega, k$ and λ. (b) Find expressions for E and B. s
View full solution →(a) Determine,$B _0, \omega, k$ and λ. (b) Find expressions for E and B. s
A parallel plate capacitor (Fig.) made of circular plates each of radius R = 6.0 cm has a capacitance C = 100 pF .The capacitor is connected to a 230 V ac supply with a (angular) frequency of 300 rad $s^{-1}$.
(a) What is the rms value of the conduction current?
(b) Is the conduction current equal to the displacement current?
(c) Determine the amplitude of B at a point 3.0 cm from the axis between the plates.
View full solution →(a) What is the rms value of the conduction current?
(b) Is the conduction current equal to the displacement current?
(c) Determine the amplitude of B at a point 3.0 cm from the axis between the plates.
The given figure shows a capacitor made of two circular plates each of radius 12 cm, and separated by 5.0 cm. The capacitor is being charged by an external source (not shown in the figure). The charging current is constant and equal to 0.15 A.
(a) Calculate the capacitance and the rate of change of potential difference between the plates.
(b) Obtain the displacement current across the plates.
(c) Is Kirchhoff's first rule (junction rule) valid at each plate of the capacitor? Explain.
(a) Calculate the capacitance and the rate of change of potential difference between the plates.
(b) Obtain the displacement current across the plates.
(c) Is Kirchhoff's first rule (junction rule) valid at each plate of the capacitor? Explain.
Write characteristics of different components of electromagnetic waves and describe them.
__________ produces magnetic field in the same way as conduction current.
Variable electric field between plates of capacitor produces _________ and ___________.
Electromagnetic waves can move only in ____________.
Electromagnetic waves conserve energy and ____________.
According to Gauss's law of magnetism, total associated with closed surface is _________.
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