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Electromagnetic Waves Physics - Electromagnetic Waves

Uttarakhand Board (UBSE) - STD 11 Science - Physics (Uttarakhand - English Medium). 30 questions in this chapter.

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 (1 Marks)1 Mark
An electric field $\overrightarrow{\text{E}}$ and a magnetic field $\overrightarrow{\text{B}}$ exist in a region. The fields are not perpendicular to each other.
  • A
    This is not possible.
  • B
    No electromagnetic wave is passing through the region.
  • ✓
    An electromagnetic wave may be passing through the region.
  • D
    An electromagnetic wave is certainly passing through the region.

Answer: C.

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Q 2M.C.Q (1 Marks)1 Mark
A compass needle is placed in the gap of a parallel plate capacitor. The capacitor is connected to a battery through a resistance. The compass needle:
  • A
    Does not deflect.
  • B
    Deflects for a very short time and then comes back to the original position.
  • C
    Deflects and remains deflected as long as the battery is connected.
  • ✓
    Deflects and gradually comes to the original position in a time that is large compared to the time constant.

Answer: D.

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Q 4M.C.Q (1 Marks)1 Mark
Which of the following have zero average value in a plane electromagnetic wave?
  1. Electric field.
  2. Magnetic field.
  3. Electric energy.
  4. Magnetic energy.
  • ✓
    $A$ and $B$
  • B
    $A$ and $C$
  • C
    $B$ and $C$
  • D
    $C$ and $D$

Answer: A.

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Q 5M.C.Q (1 Marks)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.
  • ✓
    $A$ and $B$
  • B
    $B$ and $C$
  • C
    $C$ and $D$
  • D
    $A$ and $C$

Answer: A.

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Q 73 Marks Question3 Marks
A point charge is moving along a straight line with a constant velocity u. Consider a small area A perpendicular to the direction of motion of the charge (El). Calculate the displacement current through the area when its distance from the charge is x. The value of x is not large so that the electric field at any instant is essentially given by Coulomb's law.
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Q 93 Marks Question3 Marks
A parallel-plate capacitor of plate-area A and plate separation d is joined to a battery of emf $\in$ and internal resistance R at t = 0. Consider a plane surface of area $\frac{\text{A}}{2}$ parallel to the plates and situated symmetrically between them. Find the displacement current through this surface as a function of time.
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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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Q 125 Marks Questions5 Marks
The intensity of the sunlight reaching Earth is $1380Wm^{-2}$. Assume this light to be a plane, monochromatic wave. Find the amplitudes of electric and magnetic fields in this wave.
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Q 135 Marks Questions5 Marks
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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Q 14Case study (4 Marks)4 Marks
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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Q 15Case study (4 Marks)4 Marks
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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