The Magnitude of the Poynting Vector of a Planar Electromagnetic

question 38

Multiple Choice

The magnitude of the Poynting vector of a planar electromagnetic wave has an average value of 0.724 W/m². What is the maximum value of the magnetic field in the wave? (c = 3.0 x 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

• A) 77.9 nT
• B) 55.1 nT
• C) 38.9 nT
• D) 108 nT
• E) 156 nT

---

Definitions:

Non-necessary Purchases

Expenditures on items or services that are not essential for basic living or business operations.

Minors

Individuals under the legal age of adulthood, typically under 18 years old, who have limited legal rights and responsibilities.

Contract

A legal agreement between parties that creates mutual obligations enforceable by law.

Ratify

To ratify is to formally approve or confirm an agreement or treaty, often by a vote or other formal decision-making process.