JEE Mains · Physics · STD 12 - 8. Electromagnetic waves
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 \(v =\frac{1}{\sqrt{\mu_{0} \varepsilon_{0}}}\). 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 & Solution
Correct Answer
(C) Statement \(I\) is correct but statement \(II\) is false
Step-by-step Solution
Detailed explanation
The statement \(II\) is wrong as the velocity of \(sm\) wave in a medium is \(\frac{1}{\sqrt{\mu \varepsilon}}=\frac{1}{\sqrt{\mu_{0} \mu_{ r } \varepsilon_{0} \varepsilon_{ r }}}\).
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