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Previous Year Questions (2014-19) - Electromagnetic Waves NEET Notes | EduRev

NEET : Previous Year Questions (2014-19) - Electromagnetic Waves NEET Notes | EduRev

The document Previous Year Questions (2014-19) - Electromagnetic Waves NEET Notes | EduRev is a part of the NEET Course Physics 28 Years Past year papers for NEET/AIPMT Class 12.
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Q.1. Which colour of the light has the longest wavelength?    (2019)
A: Red
B: Blue
C: Green
D: Violet
Ans: A
Solution:

Red has the longest wavelength among the given options.

Q.2. An em wave is propagating in a medium with a velocityThe instantaneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will be along :-    (2018)
A: â€“z direction
B: +z direction
C: â€“y direction
D: â€“x direction
Ans:
B
Solution:

(Therefore, electric field vector is along + y axis)

i.e., direction of magnetic filed vector is along + z direction.

Q.3. In an electromagnetic wave in free space the root mean square value of the electric field is Erms = 6V/m. The peak value of the magnetic field is :-    (2017)
A: 2.83 Ã— 10â€“8 T
B: 0.70 Ã— 10â€“8 T
C: 4.23 Ã— 10â€“8 T
D: 1.41 Ã— 10â€“8 T
Ans: A
Solution:

Q.4. Out of the following options which one can be used to produce a propagating electromagnetic wave ?    (2016)
A: An accelerating charge
B: A charge moving at constant velocity
C: A stationary charge
D: A charge less particle
Ans:
A
Solution:

An electric charge at rest has electric field in the region around it, but magnetic field is absent. A moving charge produces both electric and magnetic field. When a charge is moving with constant velocity, electric and magnetic field will not change with time. Therefore, no electromagnetic wave will be produced.
But, if the charge is moving with non-zero acceleration, electric and magnetic field will change with space and time. Electromagnetic waves will be produced.
Therefore, accelerated charge emits electromagnetic waves.

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