The speed of light depends:

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

When light propagates in vacuum there is an electric field and a magnetic field. These fields,

Choose the correct option:

Three observers A, B and C measure the speed of light coming from a source to be V_A, V_B and V_C. 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

A magnetic field can be produced by:

1.  a moving charge

2.  a changing electric field

3.  none of them

4.  both of them

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:

Dimensions of 1/(µ₀ε₀) is

1.   L/T

2.   T/L

3.   L²/T²

4.   T²/L² 

Electromagnetic waves are produced by:
1. a static charge
2. a moving charge
3. an accelerating charge
4. chargeless particles

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

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.