
Nearly of the power of a light bulb is converted to visible radiation. The change in average intensities of visible radiation, at a distance of from the bulb to a distance of is . The value of '' will be


Important Questions on Electromagnetic Waves
If and represent electric field and propagation vectors of the EM waves in vacuum, then magnetic field vector is given by:
( angular frequency)

The electric field and magnetic field components of an electromagnetic wave going through vacuum is described by
Then the correct relation between and is given by


Match List I and List II
A | Gauss’s Law in Electrostatics | I | |
B | Faraday's Law | II | |
C | Gauss’s Law in Magnetism | III | |
D | Ampere-Maxwell Law | IV |
Choose the correct answer from the options given below :

Given below are two statements :
Statement I : Electromagnetic waves are not deflected by electric and magnetic field.
Statement II : The amplitude of electric field and the magnetic field in electromagnetic waves are related to each other as .
In the light of the above statements, choose the correct answer from the options given below:



Match List I and List II
List I | List II | ||
A | Microwaves | I | Physiotherapy |
B | UV rays | II | Treatment of cancer |
C | Infra-red rays | III | Lasik eye surgery |
D | X-rays | IV | Aircraft navigation |
Choose the correct answer from the option given below:
