Electromagnetic Waves Test

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Electromagnetic Waves Test - 15

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Question 1
1 / -0

Electromagnetic waves are transverse in nature is evident by

A
polarization

B
interference

C
reflection

D
diffraction

Solution
Question 2
1 / -0

An electromagnetic wave is propagating along Y-axis. Then

A
oscillating electric field is along X-axis and oscillating magnetic field is along Y-axis

B
oscillating electric field is along Z-axis and oscillating magnetic field is along X-axis

C
both oscillating electric and magnetic fields are along Y-axis, but phase difference between them is $$90^\circ$$

D
both oscillating electric and magnetic fields are mutually perpendicular in arbitrary direction

Solution

$$Answer:-$$ B option
electromagnetic radiation consists of electromagnetic waves, which are synchronized oscillations of electric and magnetic fields that propagate at the speed of light through a vaccum. The oscillations of the two fields are perpendicular to each other and perpendicular to the direction of energy and wave propagation, forming a transverse wave.
so if propogation is along Y-direction ,Electric field will be along X or Z ,if it is along Z -direction than Magnetic field has to be in X -direction.
Question 3
1 / -0

In an electromagnetic wave, the direction of the magnetic induction $$\vec{B}$$ is

A
parallel to the electric field $$\vec{E}$$

B
perpendicular to the electric field $$\vec{E}$$

C
antiparallel to the pointing vector $$\vec{S}$$

D
random

Solution

$$Answer:-$$ B
The electric field is always perpendicular to the magnetic field, and both fields are directed at right-angles to the direction of propagation of the wave. In fact, the wave propagates in the direction $$\vec{E} \times \vec{B}$$. Electromagnetic waves are clearly a type of transverse wave.
Question 4
1 / -0

Light wave is travelling along y-direction. If the corresponding $$\vec{E}$$ vector at any time along the $$x-$$axis, the direction of $$\vec{B}$$ vector at that time is along

A
$$y-$$axis

B
$$x-$$axis

C
$$z-$$axis

D
$$-z-$$axis

Solution

Light wave is an electromagnetic wave in which $$\vec{E}$$ and $$\vec{B}$$ are at right angles to each other as well as at right angles to the direction of wave propagation. So from the given information in the question, the direction of $$\vec{B}$$ vector is in positive $$z$$ direction.
Question 5
1 / -0

Maxwell's corrections to Ampere's law was required when the later was extended to:

A
a static situation

B
a non-static situation

C
a semi-static situation

D
a quasi-static situation

Solution

The original form of Maxwell's circuital law relates magnetic fields to electric currents that produce them. It determines the magnetic field associated with a given current (static), or the current associated with a given magnetic field.
$$\bigtriangledown\times B=\mu_0 J$$

The circuital equation is extended by including the polarization current, thereby remedying the limited applicability of the original circuital law by Ampere. Thus it is for the non-static situation.
$$\bigtriangledown\times H=J_f+\dfrac{dD}{dt}$$
Question 6
1 / -0

Maxwell introduced displacement current to remove the conceptual contradiction in

A
Gauss's law in electrostatics

B
Gauss's law in magnetism

C
Faraday's law

D
Ampere's law

Solution

Maxwell pointed out the inconsistency of the Ampere's circuital law, when this law was applied to an electric circuit having a capacitor, the law appeared wrong or incomplete. Because no current was assumed in the space between the plates of capacitor. Maxwell said that there is also a current flow, in the space between the plates of a capacitor due to time varying electric field between the plates. Maxwell named this current as displacement current ($$i_{d}$$). This concept makes a continuous flow of current in an electric circuit containing a capacitor.
Now the improved Ampere's law, called Ampere-Maxwell's law is given by:
$$\oint\vec B.\vec dl=\mu_{0}i_{c}+\mu_{0}\varepsilon_{0}\dfrac{d\phi_{E}}{dt}$$
Question 7
1 / -0

Fill in the blanks.
Current flowing through the resistor is known as ________ , while the current flowing through the capacitor is commonly known as _______.

A
eddy current, displacement current

B
displacement current , conduction current

C
conduction current, eddy current

D
conduction current, displacement current

Solution

Current does not flow through the capacitor . But the current that flows out of one electrode of capacitor equals the current that flows in to the other electrode. The net effect is as if there is a current flowing through the path containing the capacitor. This is known as displacement current.
But current actually flows through the resistor known as conduction current.
Question 8
1 / -0

An AM radio wave is emitted by a radio antenna and travels across flat ground. Find out the direction of the magnetic field component of the wave?

A
Parallel to the ground and perpendicular to the direction of propagation

B
Perpendicular to the ground and to the direction of propagation

C
Parallel to the ground and to the direction of propagation

D
Perpendicular to the ground and parallel to the direction of propagation

E
Parallel to the electric field component of the wave

Solution

According to Maxwell an accelerated charge produces a sinusoidal time varying magnetic field which in turn produces a time varying electric field .The two fields so produced are mutually perpendicular to each other and constitute an electromagnetic wave and propagate in space in the direction perpendicular to both the fields.
An AM wave is also an electromagnetic wave therefore its magnetic field component would be parallel to ground and perpendicular to the direction of propogation.
Question 9
1 / -0

According to Maxwell's hypothesis, changing of electric field give rise to

A
Magnetic field

B
Pressure gradient

C
Charge

D
Voltage

Solution

Changing of electric field produces displacement current which produces magnetic field. So, changing electric field produces magnetic field.
Question 10
1 / -0

Identify which of the following is NOT a characteristic of electromagnetic waves?

A
contain electrical properties

B
have crests and troughs

C
contain magnetic properties

D
travel through space

E
have crests but no troughs

Solution

Electromagnetic waves (EM) have sinusoidal electrical as well as magnetic waves at right angle to each other and the EM waves propagate through the space with a speed equal to speed of light.
Also the EM waves have both crests and troughs.

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Electromagnetic Waves Test - 15

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Electromagnetic Waves Test - 15

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Question 1

polarization

interference

reflection

diffraction

Solution

Question 2

oscillating electric field is along X-axis and oscillating magnetic field is along Y-axis

oscillating electric field is along Z-axis and oscillating magnetic field is along X-axis

both oscillating electric and magnetic fields are along Y-axis, but phase difference between them is $$90^\circ$$

both oscillating electric and magnetic fields are mutually perpendicular in arbitrary direction

Solution

Question 3

parallel to the electric field $$\vec{E}$$

perpendicular to the electric field $$\vec{E}$$

antiparallel to the pointing vector $$\vec{S}$$

random

Solution

Question 4

$$y-$$axis

$$x-$$axis

$$z-$$axis

$$-z-$$axis

Solution

Question 5

a static situation

a non-static situation

a semi-static situation

a quasi-static situation

Solution

Question 6

Gauss's law in electrostatics

Gauss's law in magnetism

Faraday's law

Ampere's law

Solution

Question 7

eddy current, displacement current

displacement current , conduction current

conduction current, eddy current

conduction current, displacement current

Solution

Question 8

Parallel to the ground and perpendicular to the direction of propagation

Perpendicular to the ground and to the direction of propagation

Parallel to the ground and to the direction of propagation

Perpendicular to the ground and parallel to the direction of propagation

Parallel to the electric field component of the wave

Solution

Question 9

Magnetic field

Pressure gradient

Charge

Voltage

Solution

Question 10

contain electrical properties

have crests and troughs

contain magnetic properties

travel through space

have crests but no troughs

Solution

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