Question Bank MCQ • 2 Marks Section 3: Electromagnetic Theory Poynting vector

QB_PH_082: Poynting vector

Question Statement

A coaxial cable carries current $I$ at voltage $V$. Integrating the Poynting vector over the dielectric cross section yields:
(A) P = V I
(B) P = \frac{1}{2} V I
(C) P = V^2 / I
(D) P = 0
Correct Answer
A
Verified Key

Step-by-Step KaTeX Derivation & Detailed Explanation

### Solution: Poynting's theorem proves electromagnetic power transported through the dielectric is $P = VI$.
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