A capacitor is 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. The charging current is constant and equal to 0.15 A. The displacement current across the plates is:

1. 0

2. 0.14 A

3. 0.16 A

4. 0.15 A

Subtopic: 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 $\overrightarrow{B}$ 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: Displacement Current |

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A plane electromagnetic wave travels in a vacuum along the z-direction. Then the directions of its electric and magnetic field vectors will be in:

1. The x-y plane and they are parallel to each other.

2. The x-y plane and they are mutually perpendicular to each other.

3. The y-z plane and they are mutually perpendicular to each other.

4. The z-x plane and they are parallel to each other.

Subtopic: 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

69%

Subtopic: 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?

$\left(1\right){10}^{11}Hz\phantom{\rule{0ex}{0ex}}\left(2\right){10}^{7}Hz\phantom{\rule{0ex}{0ex}}\left(3\right){10}^{8}Hz\phantom{\rule{0ex}{0ex}}\left(4\right){10}^{9}Hz$

73%

Subtopic: Generation of EM Waves |

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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

From NCERT

Subtopic: Electromagnetic Spectrum |

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The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is ${B}_{0}=510nT$. What is the amplitude of the electric field part of the wave?

1. 200 N/C

2. 153 N/C

3. 150 N/C

4. 510 N/C

Subtopic: Properties of EM Waves |

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Suppose that the electric field amplitude of an electromagnetic wave is ${E}_{0}=120N/C$ and that its frequency is $\nu =50.0MHz$. The value of k is:

(1) 2.01 rad/m

(2) 1.72 rad/m

(3) 1.05 rad/m

(4) 2.41 rad/m

68%

Subtopic: Generation of EM Waves |

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In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of $2.0\times {10}^{10}Hz$ and amplitude 48 V/m. What is the amplitude of the oscillating magnetic field?

$\left(1\right)4.2\times {10}^{-8}T\phantom{\rule{0ex}{0ex}}\left(2\right)2.4\times {10}^{-7}T\phantom{\rule{0ex}{0ex}}\left(3\right)3.8\times {10}^{-8}T\phantom{\rule{0ex}{0ex}}\left(4\right)1.6\times {10}^{-7}T$

75%

Subtopic: Properties of EM Waves |

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The electric field part of an electromagnetic wave in vacuum is,

\(\vec{E}=\left ( 3.1~N/C \right )cos\left [ \left ( 1.8~rad/m \right )y\\~~~~~~+\left ( 5.4\times10^{8} ~rad/s\right )t \right ]\hat{i}\)

What is the frequency of the wave?

$\begin{array}{rcl}& & 1.5.7\times {10}^{7}Hz\\ & & 2.9.3\times {10}^{7}Hz\\ & & 3.8.6\times {10}^{7}Hz\\ & & 4.7.5\times {10}^{7}Hz\end{array}$

Subtopic: Properties of EM Waves |

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