Quiz for the JUAS 2023 students – Electromagnetism


Quiz for JUAS students 2023 - Electromagnetism

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1 / 18

In many applications of the coaxial cable, how much is the characteristic impedance?

2 / 18

The charge conservation principle states that the flux of current density through a closed surface is equal to:

3 / 18

The Gauss law states that, given an arbitrary distribution of charge density inside the volume, the total amount of charge inside this volume is equal to

4 / 18

What is the velocity of the electromagnetic waves in vacuum?

5 / 18

For the plane waves, there are two solutions representing two waves, they are:

6 / 18

What happens below the cut-off frequency in a waveguide?

7 / 18

The Ampere Law states that the circulation of the magnetic field along a closed path equals the flux of current through any open surface confined by the closed path. Maxwell added a term to balance the equations that is:

8 / 18

In particle accelerators, the resonant cavities are used to:

9 / 18

Applying the Stokes theorem, the two Faraday and Ampere-Maxwell law local form are (select both correct answers):

10 / 18

The Faraday law states that the time variation of the magnetic induction flux through any open surface confined by a closed path is equal to:

11 / 18

Applying the Gauss-Ostrogradski theorem, the two Gauss laws in local forms are (select both correct answers):

12 / 18

By applying the phasor definition, the time derivative is replaced by the factor

13 / 18

The skin depth is:

14 / 18

Can the phase velocity , the velocity of the wave-front in the waveguide, be larger than the speed of light c?

15 / 18

The Gauss law for the magnetic induction demonstrates that the flux of the magnetic induction through the volume surface is equal to:

16 / 18

In case of rectangular waveguides, how are the modes classified?

17 / 18

How are the cavities fed?

18 / 18

What is the order of magnitude of the quality factor Q in the superconducting Niobium cavities?

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