# 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 |
66%
From NCERT
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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 |
70%
From NCERT
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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 |
From NCERT
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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 |
66%
From NCERT
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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 |
90%
From NCERT
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An electromagnetic wave going through vacuum is described by;
$$E=E_0 \sin (k x-\omega t) ; B=B_0 \sin (k x-\omega t).$$
Then:
1. $$E_0 k=B_0 \omega$$
2. $$E_0 B_0=\omega k$$
3. $$E_0 \omega=B_0 k$$
4.  none of these

Subtopic:  Properties of EM Waves |
79%
From NCERT
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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 |
From NCERT
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Consider the following two statements regarding a linearly polarized, plane electromagnetic wave:

(A) The electric field and the magnetic field have equal average values.

(B) The electric energy and the magnetic energy have equal average values.

1.  Both A and B are true

2.  A is false but B is true

3.  B is false but A is true

4.  Both A and B are false

Subtopic:  Properties of EM Waves |
63%
From NCERT
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A free electron is placed in the path of a plane electromagnetic wave. The electron will start moving

1.  along the electric field

2.  along the magnetic field

3.  along the direction of propagation of the wave

4.  in a plane containing the magnetic field and the direction of propagation

Subtopic:  Properties of EM Waves |
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A plane electromagnetic wave is incident on a material surface. The wave delivers momentum $$p$$ and energy $$E.$$ Then:

 1 $$p=0, E \neq0$$ 2 $$p\neq0, E=0$$ 3 $$p\neq0, E \neq0$$ 4 $$p=0, E=0$$
Subtopic:  Generation of EM Waves |
77%
From NCERT
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