question_answer

The energy associated with electric field is (\[{{U}_{E}}\]) and with magnetic field is (\[{{U}_{B}}\]) for an electromagnetic wave in free space. Then: [JEE Main 09-Jan-2019 Evening]

A) \[{{U}_{E}}<{{U}_{B}}\]

B) \[{{U}_{E}}=\,\frac{{{U}_{B}}}{2}\]

C) \[{{U}_{E}}={{U}_{B}}\]

D) \[{{U}_{E}}>{{U}_{B}}\]

Correct Answer: C

Solution :

[c] Energy density in electric field

Energy density in magnetic field