Question

Given below are two statements:
Statement I : A time varying electric field is a source of changing magnetic field and vice-versa. Thus a disturbance in electric or magnetic field creates EM waves.
Statement II : In a material medium. The EM wave travels with speed $v=\frac{1}{\sqrt{{\mu }_0{\epsilon }_0}}$.
In the light of the above statements, choose the correct answer from the options given below:

• A. Both statement I and statement II are true.
• B. Both statement I and statement II are false.
• C. Statement I is correct but statement II is false.
• D. Statement I is incorrect but statement II is true.

Answer 1

Answer: (C)

The statement II is wrong as the velocity of $\epsilon m$ wave in a medium is $\frac{1}{\sqrt{\mu \epsilon }}=\frac{1}{\sqrt{{\mu }_0{\mu }_r{\epsilon }_0{\epsilon }_r}}$.