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  • Given below are two statements : Statement I: A time-varying electric field is a source of changing magnetic fields and vice-versa. Thus a disturbance in an electric or magn

Given below are two statements :
Statement I: A time-varying electric field is a source of changing magnetic fields and vice-versa. Thus a disturbance in an electric or magnetic field creates EM waves.
Statement II: In a material medium, the EM wave travels with speed \mathrm{v=\frac{1}{\sqrt{\mu_{0} \in_{0}}}}.
In the light of the above statements, choose the correct answer from the options  given below.

Option: 1

Both statement I and statement II are true


Option: 2

Both statement I and statement II are false


Option: 3

Statement I is correct but statement II is false


Option: 4

Statement I is incorrect but statement II is true


Answers (1)

best_answer

Statement I is correct as a time-varying electric field is a source of changing magnetic fields and vice-versa as per the Maxwell's equations.

In the material medium speed of light wave changes.
\mathrm{v=\frac{c}{\sqrt{\mu \epsilon }}= \frac{c}{\sqrt{\mu _{r} \epsilon _{r}}}}

For vacuum, the speed of light wave is

\mathrm{v= \frac{1}{\sqrt{\mu _{o} \epsilon _{o}}}}

The correct answer is (3)

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