Electromagnetic waves are produced by 

1. A static charge

2. A moving charge

3. An accelerated charge

4. Charged particles

Concept Questions :-

Generation of EM waves
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The idea of displacement current was introduced by 

1. Maxwell 

2. Hertz

3. Marconi

4. Bose

Concept Questions :-

Problem with Ampere's law
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The direction of propagation of the electromagnetic wave is the same as that of (Here E=electric field vector and B=magnetic field vector):

(1) E×B

(2) B×E

(3) E

(4) B

Concept Questions :-

Properties of EM waves
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In a E.M.W, phase difference between E and B is :

1. zero

2. π/2

3. π

4. π/3

Concept Questions :-

Generation of EM waves
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An electromagnetic radiation has an energy of 13.2 keV. Then, the radiation belongs to the region of 

1. visible light

2. ultraviolet

3. infrared

4. X-ray

Concept Questions :-

Electromagnetic spectrum
Please attempt this question first.

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In an electromagnetic wave in free space the root mean square value of the electric field is Erms=6 V/m. The peak value of the magnetic field is:

1. 1.41×10-8T

2. 2.83×10-8T

3. 0.70×10-8T

4. 4.23×10-8 T 

Concept Questions :-

Properties of EM waves
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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

Concept Questions :-

Generation of EM waves
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The energy of the EM wave is of the order of 15 KeV. To which part of the spectrum does it belong?

1. X-rays

2. Infrared rays

3. Ultraviolet rays

4. γ-rays

Concept Questions :-

Properties of EM waves
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The condition under which a microwave oven heats up a food item containing water molecules most efficiently in



1. the frequency of the microwave must match the resonant frequency of the water molecules

2. the frequency of the microwave  has no relation with the natural frequency of water molecules

3. microwave are heatwaves, so always produce heating

4. infrared waves produce heating in a microwave oven
 

Concept Questions :-

Properties of EM waves
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The electric field associated with an electromagnetic wave in vacuum is given by E= 40coskz-6×108t,where E, z, and t are in volt/m, meter, and second respectively. The value of wave vector k is:

1. 2 m-1                               2. 0.5 m-1

3. 6 m-1                               4. 3 m-1             

Concept Questions :-

Properties of EM waves
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