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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 |

Â 89%

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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 |

Â 74%

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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

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 |

Â 85%

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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 |

Â 67%

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In a plane electromagnetic wave, the electric field oscillates sinusoidally at a frequency of $\mathrm{}$\(2.0\times 10^{10}~\text{Hz}\) 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 |

Â 75%

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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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