The magnitude of the electric and magnetic fields in an electromagnetic wave are related as:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → \( B_0 = E_0/c \)
In an electromagnetic wave the electric and magnetic fields vary in phase, and the ratio of their amplitudes is the speed of the wave in vacuum:
\( \displaystyle \frac{E_0}{B_0} = c \;\Rightarrow\; B_0 = \frac{E_0}{c} \)
NCERT (2026-27):
Nature of Electromagnetic Waves – “… It is also seen from Maxwell’s equations that the magnitude of the electric and the magnetic fields in an electromagnetic wave are related as
\( \displaystyle B_0 = \frac{E_0}{c} \qquad (8.10) \) ”