Question Bank MCQ • 1 Mark Section 3: Electromagnetic Theory Poynting vector

QB_PH_065: Poynting vector

Question Statement

The electromagnetic momentum density $\mathbf{g}$ in vacuum in terms of the Poynting vector $\mathbf{S}$ is:
(A) \mathbf{S} / c^2
(B) \mathbf{S} / c
(C) c \mathbf{S}
(D) \epsilon_0 \mathbf{S}
Correct Answer
A
Verified Key

Step-by-Step KaTeX Derivation & Detailed Explanation

### Solution: $\mathbf{g} = \mu_0 \epsilon_0 \mathbf{S} = \mathbf{S} / c^2$.
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