# Electromagnetic Waves MCQs

NEET  Physics is the scoring paper in the medical entrance examination. Here, you will discover the NEET Physics MCQ Questions for all Concepts as per the latest syllabus. Practice more on a regular basis with these NEET Physics objective questions on air pollution and improve your subject knowledge & problem-solving skills along with time management. NEET Physics Electromagnetic Waves Multiple Choice Questions make you feel confident in answering the question in the exam & increases your scores to high.

## MCQ on Electromagnetic Waves

1. Electromagnetic waves are produced by
(a) A static charge
(b) An accelerated charge
(c) A moving charge
(d) Charged particles

2. The direction in which electromagnetic waves propagate is the same as that of
(a) $$\overrightarrow { E } \times \overrightarrow { B }$$
(b) $$\overrightarrow { B } \times \overrightarrow { E }$$
(c) $$\overrightarrow { E }$$
(d) $$\overrightarrow { B }$$

Answer: (a) $$\overrightarrow { E } \times \overrightarrow { B }$$

3. In electromagnetic waves the phase difference between electric field vector and magnetic field vector is
(a) zero
(b) π/2
(c) π
(d) π/3

4. In an electromagnetic wave in free space, the root mean square value of the electric field is 6 V/m. The peak value of the magnetic field is
(a) 2.83 x 10-8 T
(b) 1.51 x 10-8 T
(c) 0.80 x 10-8 T
(d) 4 x 10-8 T

Answer: (a) 2.83 x 10-8 T

5. Which of the following can be used to produce a propagating electromagnetic wave?
(a) Charge moving at a constant speed
(b) Chargeless particle
(c) Stationary charge
(d) An accelerating charge

6. To which part of the spectrum does EM waves belong if the energy of the wave is of the order of 15 KeV.
(a) X rays
(b) Infrared rays
(c) Ultraviolet rays
(d) Gamma rays

7. The ratio of the amplitude of the magnetic field to the amplitude of the electric field for electromagnetic wave propagation in a vacuum is equal to
(a) Unity
(b) Speed of light in vacuum
(c) Reciprocal of the speed of light in vacuum
(d) The ratio of magnetic permeability to electrical susceptibility in a vacuum.

Answer: (c) Reciprocal of the speed of light in vacuum

8. Which properties amount the following is false about electromagnetic waves?
(a) The energy in an electromagnetic wave is divided equally between electric and magnetic vectors.
(b) Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave.
(c) These waves do not require any material medium for propagation
(d) Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time

Answer: (b) Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of the wave.

9. The velocity of electromagnetic radiation in a medium of permittivity ε0 and permeability μ0 is given by
(a) $$\sqrt { { \E }_{ 0 }/{ \mu }_{ 0 } }$$
(b) $$\sqrt { { \E }_{ 0 }{ \mu }_{ 0 } }$$
(c) 1/$$\sqrt { { \E }_{ 0 }{ \mu }_{ 0 } }$$
(d) $$\sqrt { { \mu }_{ 0 }{ /\E }_{ 0 } }$$

Answer: (c) 1/$$\sqrt { { \E }_{ 0 }{ \mu }_{ 0 } }$$