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
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A wave is propagating in a medium of electric dielectric constant 2 and relative magnetic permeability 50. The wave impedance of such a medium is

(1) 5 Ω

(2) 376.6 Ω

(3) 1883 Ω

(4) 3776 Ω

Concept Questions :-

Properties of EM waves
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If λv, λx and λm represent the wavelengths of visible light, x-rays and microwaves respectively, then-

1.  λm > λx > λv

2.  λv > λm > λx

3.  λv > λx > λm

4.  λm > λv > λx

Concept Questions :-

Electromagnetic spectrum
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Which of the following rays are not electromagnetic waves ?

(a) γ-rays                  (b) β-rays
(c) Heat rays              (d) X-rays

Concept Questions :-

Introduction
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The displacement current flows in the dielectric of a capacitor when the potential difference between its plates:-

1.  is changing with time.

2.  is changing with distance.

3.  becomes zero.

4.  has assumed a constant value.

Concept Questions :-

Introduction
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Assertion: For cooking in a microwave oven, food is always kept in metal containers

Reason: The energy of microwave is easily transferred to the food in metal container

  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

Concept Questions :-

Properties of EM waves
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