Topic : electromagnetic waves

Oscillating magnetic field in a plane, electromagnetic wave is given by $\vec{B}_y = 4 \times 10^{-6}\sin[9 \times 10^9 t - 30x]$ tesla. Expression for oscillating electric field (in N C$^{-1}$) will be

Light wave is travelling along +y-direction. If the corresponding $\vec{E}$ vector at any time is along the +z-axis. Then the direction of $\vec{B}$ vector at this time is along:

An electromagnetic wave propagates in a medium, whose electric field vector is given as $E = 200\sin (18\times 10^8t + 8x)$ V m$^{-1}$. Refractive index of medium and amplitude of magnetic field will be

Electromagnetic waves are produced by

Which of the following statement is correct about electromagnetic waves?

The electric field in a plane electromagnetic wave is given by $E_z = 60 \cos (5x + 1.5 \times 10^9 t)V/m$. Then expression for the corresponding magnetic field is (here subscripts denote the direction of the field):

A plane electromagnetic wave of frequency 25 MHz travels in free space along the x-direction. At a particular point in space and time $\vec{E} = 7.5\hat{j}$ V/m. The value of $\vec{B}$ at this point is

A spaceship is moving away from Earth with speed 0.03c, where c is speed of light in air. The spaceship emits signal of frequency 6×10⁷ Hz. Frequency of signal observed by the observer on Earth will be

A point source is emitting an electromagnetic wave with a certain frequency uniformly in all directions. If the wave is moving away from the source in same medium, then select incorrect option.

The magnetic field in a plane electromagnetic wave is given by $B=(100\sqrt{\pi} \mu T)\sin(4 \times 10^{16} t - 2 \times 10^8 x)$. The average energy density of the wave is

The direction of EM wave propagation is along (symbols have their usual meaning)

The amplitude of the electric field in a plane electromagnetic wave, in vacuum, is 18 × 10⁻³ V/m. The amplitude of the magnetic field will be

If the distance between a point source of light and a screen is doubled, then the intensity will be