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Free CBSE - Class 12 Physics - Electromagnetic Waves worksheets

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1.
In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of $2.0 \times 10^{10}$ Hz and amplitude $48 \text{ V m}^{-1}$. (c) Show that the average energy density of the $E$ field equals the average energy density of the $B$ field. [$c = 3 \times 10^8 \text{ m s}^{-1}$.]
2.
A radio can tune in to any station in the $7.5$ MHz to $12$ MHz band. What is the corresponding wavelength band?
3.
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?
4.
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?
5.
Suppose that the electric field amplitude of an electromagnetic wave is $E_0 = 120$ N/C and that its frequency is $\nu = 50.0$ MHz. (a) Determine, $B_0, \omega, k$, and $\lambda$.
6.
Suppose that the electric field amplitude of an electromagnetic wave is $E_0 = 120$ N/C and that its frequency is $\nu = 50.0$ MHz. (b) Find expressions for $E$ and $B$.
7.
The terminology of different parts of the electromagnetic spectrum is given in the text. Use the formula $E = h\nu$ (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?
8.
In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of $2.0 \times 10^{10}$ Hz and amplitude $48 \text{ V m}^{-1}$. (a) What is the wavelength of the wave?
9.
In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of $2.0 \times 10^{10}$ Hz and amplitude $48 \text{ V m}^{-1}$. (b) What is the amplitude of the oscillating magnetic field?
10.

Figure 8.5 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 0.15A. (c) Is Kirchhoff’s first rule (junction rule) valid at each plate of the capacitor? Explain.

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