Question types

Electromagnetic Waves question types

30 questions across 5 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

30
Questions
5
Question groups
5
Question types
Sample Questions

Electromagnetic Waves questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q [1M]1 Mark
Dimensions of $\frac{1}{(\mu_0\in_0)}$ is:

  1. $\frac{\text{L}}{\text{T}}$

  2. $\frac{\text{T}}{\text{L}}$

  3. $\frac{\text{L}^2}{\text{T}^2}$

  4. $\frac{\text{T}^2}{\text{L}^2}$

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Q 2M.C.Q [1M]1 Mark
Speed of electromagnetic waves is the same:
  1. For all wavelengths.
  2. In all media.
  3. For all intensities.
  4. For all frequencies.
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Q 3M.C.Q [1M]1 Mark
A free electron is placed in the path of a plane electromagnetic wave. The electron will start moving:
  1. Along the electric field.
  2. Along the magnetic field.
  3. Along the direction of propagation of the wave.
  4. In a plane containing the magnetic field and the direction of propagation.
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Q 4M.C.Q [1M]1 Mark
Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor:
  1. Increases.
  2. Decreases.
  3. Does not change.
  4. Is zero.
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Q 5M.C.Q [1M]1 Mark
An electromagnetic wave going through vacuum is described by $\text{E}=\text{E}_0\sin(\text{kx}-\omega\text{t}),\text{ B}=\text{B}_0\sin(\text{kx}-\omega\text{t})$ Then:

  1. $\text{E}_0\text{k}=\text{B}_0\omega$

  2. $\text{E}_0\text{B}_0=\omega\text{k}$

  3. $\text{E}_0\omega=\text{B}_0\text{k}$

  4. None of these.

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Consider the situation of the previous problem. Define displacement resistance $\text{R}_\text{d}=\frac{\text{V}}{\text{i}_\text{d}}$ of the space between the plates, where V is the potential difference between the plates and id is the displacement current. Show that Rd varies with time as $\text{R}_\text{d}=\text{R}\big(\text{e}^{\text{t}/\tau}-1\big)$ 
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Q 113 Marks Question3 Marks
The magnetic field in a plane electromagnetic wave is given by $\text{B}=(200\mu\text{T})\sin\Big[\big(4.0\times10^{15}\text{s}^{-1}\big)\Big(\text{t}-\frac{\text{x}}{\text{c}}\Big)\Big]$ Find the maximum electric field and the average energy density corresponding to the electric field.
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In a microwave oven, the food is kept in a plastic container and the microwave is directed towards the food. The food is cooked without melting or igniting the plastic container. Explain.
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A metal rod is placed along the axis of a solenoid carrying a high-freqμency alternating current. It is found that the rod gets heated. Explain why the rod gets heated.
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A plane electromagnetic wave is passing through a region. Consider (a) electric field (b) magnetic field (c) electrical energy in a small volume and (d) magnetic energy in a small volume. Construct the pairs of the quantities that oscillate with equal frequencies.
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