Question

In intensity of light, contribution made by electric field is 'a' and contribution made by magnetic field is 'b', then a : b is

• A. 1 : 1
• B. c : 1
• C. $c^2:1$
• D. $1:\sqrt{c}$

Answer 1

The correct option is A 1 : 1

Ratio of intensities is $=\frac{1}{\text{/}2}{ϵ}_0{E}^2:\frac{B^2}{\text{/}2{\eta }_0}$
$=\frac{{\eta }_0{\in }_0{E}^2}{B^2}:1={\left(\frac{E}{cB}\right)}^2:1=1:1$