Out of the following options which one can be used to produce a propagating electromagnetic wave?

1. A stationary charge               

2. A chargeless particle

3. An accelerating charge         

4. A charge moving at constant velocity

Subtopic:  Generation of EM Waves |
 88%
From NCERT
NEET - 2016
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Statement I: A changing electric field produces a magnetic field.

Statement II: A changing magnetic field produces an electric field.

(1) If both statement-I and Statement-II are true, and Statement-II is the correct explanation of Statement-I.

(2) If both Statement-I and Statement-II are true but Statement-II is not the correct explanation of Statement-I.

(3) If Statement-I is true but Statement-II is false.

(4) If Statement-I is false but Statement-II is true.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Generation of EM Waves |
 59%
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The relation between electric field E and magnetic field intensity H in an electromagnetic wave is:

(1) E = H

(2) E=μ0ε0H

(3) E=ε0μ0H

(4) E=μ0ε0H

Subtopic:  Generation of EM Waves |
From NCERT
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Source of an electromagnetic wave is

(1) A charge moving with constant velocity

(2) A charge at rest

(3) A charge moving in a circular orbit

(4) Charges cannot produce an EM wave

Subtopic:  Generation of EM Waves |
 74%
From NCERT
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An accelerated charge :

(1) emits an electromagnetic wave

(2) does not emit electromagnetic wave

(3) produces a gravitational field

(4) None of these

Subtopic:  Generation of EM Waves |
 94%
From NCERT
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If a source is transmitting an electromagnetic wave of frequency 8.2×106 Hz, then the wavelength of the electromagnetic wave transmitted from the source will be:

1. 36.6 m 2. 40.5 m
3. 42.3 m 4. 50.9 m
Subtopic:  Generation of EM Waves |
 88%
From NCERT
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A circular ring of radius r is placed in a homogeneous magnetic field perpendicular to the plane of the ring. The field B changes with time according to the equation B = Kt, where K is a constant and t is the time. The electric field in the ring is

(1) Kr4

(2) Kr3

(3) Kr2

(4) K2r

Subtopic:  Generation of EM Waves |
 68%
From NCERT
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What is the energy density of electric field at a distance of 5 m from a point source of EM wave, if the electric field strength at that point be 100 V/m ?

(1) 44 x 10-9 J/m3

(2) 11 x 10-9 J/m3

(3) 22 x 10-9 J/m3

(4) 88 x 10-9 J/m3

Subtopic:  Generation of EM Waves |
 61%
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The impulse imparted by an electromagnetic pulse of energy 1.5 x 10-2 joule when it falls normally on a perfectly reflecting surface is

1. 4 x 10-10 kg-m/s

2. 2 x 10-10 kg-m/s

3.10-10 kg-m/s

4. 0.5 x 10-10 kg-m/s

Subtopic:  Generation of EM Waves |
 54%
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Electromagnetic waves are produced by:

1. static charges.
2. charges in uniform motion.
3. an oscillating charge.
4. both (2) & (3)

Subtopic:  Generation of EM Waves |
 65%
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