Which of the following statements are correct?
A. In a region of free space with electric field E, there is an energy density $\frac{1}{2}ε_0E^2$
B. An electromagnetic wave contains both electric and magnetic field.
C. Electromagnetic waves do not exert pressure
D. Hertz could not establish the wave nature of radiation.
E. No material medium is required for vibrations of electric field and magnetic field.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A, B and E only
(A) The energy density (u) in an electric field in fire space -
$u=\frac{1}{2}ε_0E^2$
(B) An EM wave consists of oscillating $\vec E$ and $\vec B$ that are perpendicular to each other and to the direction of propagation.
(E) Electromagnetic wave can propagate through a material medium.