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 a vacuum, there is an electric field and a magnetic field. These fields:

Choose the correct option from the options given below:

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.