Electromagnetic...

Which of the following relations is correct for EM waves?

A point source of electromagnetic radiation has an average power output of $$1500W$$. The maximum value of electric field at a distance of $$3m$$ from this source in $$V{m}^{-1}$$ is 

In propagation of electromagnetic wave, which of the following statement is correct ?

The electric fields of two plane electromagnetic plane waves in vacuum are given by
$$\vec{E_1}=E_0\hat{j}\cos(\omega t-kx)$$ and $$\vec{E_2}=E_0\hat{k}\cos(\omega t-ky)$$
At $$t=0$$, a particle of charge q is at origin with a velocity $$\vec{v}=0.8c\hat{j}$$ (c is the speed of light in vaccum). The instantaneous force experienced by the particle is:

If $$X$$-rays are passed through a strong magnetic field, then $$X$$-rays 

When light of wavelength  $$4000A ^ { \circ }$$  in vacuum travels through the same thickness in air and vacuum the difference in the number of waves is one. Find the thickness  $$\left( \mu _ { air } = 1.0008 \right) .$$

Why do we not use X-rays in the RADAR

Displacement current goes through the gap between the plates of a capacitor when the charge of the capacitor :-
(a) Increases
(b) Decreases
(c) Does not change
(d) Is zero

An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GHz. What is the frequency of the microwave by the observer ?(speed of light = $$3\times { 10 }^{ 8 }m{ s }^{ -1 }$$)

Consider the following two statements regarding a linearly polarized plane electromagnetic wave
(A) The electric field and the magnetic filed have equal average values
(B) The electric energy and the magnetic energy have equal average values