The speed of light depends

1. on elasticity of the medium only

2. on inertia of the medium only

3. on elasticity as well as inertia

4. neither on elasticity nor on inertia

Subtopic:  Properties of EM Waves |
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The equation of a light wave is written as \(y = A sin (kx-\omega t)\). Here, y represents

1. displacement of ether particles

2. pressure in the medium

3. density of the medium

4. electric field

Subtopic:  Properties of EM Waves |
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When light propagates in vacuum there is an electric field and a magnetic field. These fields

(a) are constant in time

(b) have zero average value

(c) are perpendicular to the direction of propagation of light

(d) are mutually perpendicular

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (a), (b) and (c)

4. (b), (c) and (d)

Subtopic:  Properties of EM Waves |
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Three observers A, B and C measure the speed of light coming from a source to be VA, VB and VC. The observer A moves towards the source and C moves away from the source at the same speed. The observer B stays stationary. The surrounding space is vacuum everywhere.

(a) \(v_{A}>v_{B}>v_{C}\)

(b) \(v_{A}<v_{B}<v_{C}\)

(c) \(v_{A}=v_{B}=v_{C}\)

(d) \(v_{B}=\frac{1}{2}\left(v_{A}+v_{C}\right)\)

Choose the correct option:

1. (a) and (b)

2. (b) and (c)

3. (c) and (d)

4. All of these

Subtopic:  Properties of EM Waves |
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A magnetic field can be produced by

1.  a moving charge

2.  a changing electric field

3.  none of them

4.  both of them

Subtopic:  Generation of EM Waves |
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A compass needle is placed in the gap of a parallel plate capacitor. The capacitor is connected to a battery through a resistance. The compass needle

1.  does not deflect

2.  deflects for a very short time and then comes back to the original position

3.  deflects and remains deflected as long as the battery is connected

4.  deflects and gradually comes to the original position in a time which is large compared to the time constant

Subtopic:  Displacement Current |
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Dimensions of 1/(µ0ε0) is

1.   L/T

2.   T/L

3.   L2/T2

4.   T2/L2 

Subtopic:  Properties of EM Waves |
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Electromagnetic waves are produced by

1.  a static charge

2.  a moving charge

3.  an accelerating charge

4.  chargeless particles

Subtopic:  Generation of EM Waves |
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An electromagnetic wave going through vacuum is described by

E = E0 sin(kx – ωt); B = B0 sin(kx – ωt).

Then

1.   E0 k = B0  ω

2.   E0 B0 = ωk

3.   E0 ω = B0 k

4.   none of these

Subtopic:  Properties of EM Waves |
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An electric field \(\vec{E}\) and a magnetic field \(\vec{B}\)  exist in a region. The fields are not perpendicular to each other.

1.  This is not possible.

2.  No electromagnetic wave is passing through the region.

3.  An electromagnetic wave may be passing through the region.

4.  An electromagnetic wave is certainly passing through the region.

Subtopic:  Properties of EM Waves |
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