A capacitor is made of two circular plates each of radius $$12~\text{cm}$$ and separated by $$5.0~\text{cm}$$. The capacitor is being charged by an external source. The charging current is constant and equal to $$0.15~\text{A}$$. The displacement current across the plates is:
1. $$0$$
2. $$0.14~\text{A}$$
3. $$0.16~\text{A}$$
4. $$0.15~\text{A}$$

Subtopic: Â Displacement Current |
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A parallel plate capacitor 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 an (angular) frequency of $$300$$ rad/s. The amplitude of $$\vec{B}$$ at the point $$3$$ cm from the axis between the plate is:

1. $$1.12\times 10^{-11}$$ T
2. $$2.01\times 10^{-12}$$ T
3. $$1.63\times 10^{-11}$$ T
4. $$1.01\times 10^{-12}$$ T

Subtopic: Â Displacement Current |
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A plane electromagnetic wave travels in a vacuum along the $${z\text{-}}$$direction. Then the directions of its electric and magnetic field vectors will be:

 1 in the $${x\text{-}y}$$ plane and they are parallel to each other. 2 in the $${x\text{-}y}$$ plane and they are mutually perpendicular to each other. 3 in the $${y\text{-}z}$$ plane and they are mutually perpendicular to each other. 4 in the $${z\text{-}x}$$ plane and they are parallel to each other.
Subtopic: Â Properties of EM Waves |
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A radio can tune in to any station in the $$7.5$$ MHz to $$12$$ MHz bands. What is the corresponding wavelength band?
1. $$40$$ to $$25$$ m
2. $$10$$ to $$100$$ m
3. $$50$$ to $$60$$ m
4. $$20$$ to $$10$$ m

Subtopic: Â Electromagnetic Spectrum |
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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?
1. $$10^{11}$$ Hz
2. $$10^7$$ Hz
3. $$10^8$$ Hz
4. $$10^9$$ Hz

Subtopic: Â Generation of EM Waves |
Â 78%
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Which physical quantity does not change in vacuum for X-rays?

 1 speed of light 2 wavelength 3 frequency 4 none of these
Subtopic: Â Electromagnetic Spectrum |
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The amplitude of the magnetic field part of a harmonic electromagnetic wave in a vacuum is $$B_0=510~\text{nT}$$What is the amplitude of the electric field part of the wave?
1. $$200~\text{N/C}$$
2. $$153~\text{N/C}$$
3. $$150~\text{N/C}$$
4. $$510~\text{N/C}$$

Subtopic: Â Properties of EM Waves |
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Suppose that the electric field amplitude of an electromagnetic wave is $$E_0 = 120~\text{N/C}$$ and that its frequency is $$\nu = 50.0~\text{MHz}$$. The value of $$k$$ is:
1. $$2.01~\text{rad/m}$$
2. $$1.72~\text{rad/m}$$
3. $$1.05~\text{rad/m}$$
4. $$2.41~\text{rad/m}$$

Subtopic: Â Generation of EM Waves |
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In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of $$2.0\times 10^{10}~\text{Hz}$$ and amplitude $$48~\text{V/m}$$. What is the amplitude of the oscillating magnetic field?
1. $$4.2\times 10^{-8}~\text{T}$$
2. $$2.4\times 10^{-7}~\text{T}$$
3. $$3.8\times 10^{-8}~\text{T}$$
4. $$1.6\times 10^{-7}~\text{T}$$

Subtopic: Â Properties of EM Waves |
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The electric field part of an electromagnetic wave in vacuum is,
$$\vec{E}=(3.1~\text{N/C}) \cos \left[(1.8~\text{rad/m}) y+\left(5.4 \times 10^8 ~\text{rad/s}\right)t\right] \hat{i}$$.
What is the frequency of the wave?
1. $$5.7\times 10^{7}~\text{Hz}$$
2. $$9.3\times 10^{7}~\text{Hz}$$
3. $$8.6\times 10^{7}~\text{Hz}$$
4. $$7.5\times 10^{7}~\text{Hz}$$

Subtopic: Â Properties of EM Waves |
Â 72%
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