Energy Density: What Is the Energy Density in the Magnetic

question 19

Multiple Choice

Energy density: What is the energy density in the magnetic field 25 cm from a long straight wire carrying a current of 12 A? (μ₀ = 4π × 10^-7 T ∙ m/A)

• A) 7.3 × 10^-5 J/m³
• B) 3.7 × 10^-5 J/m³
• C) 3.6 × 10^-4 J/m³
• D) 1.2 × 10^-4 J/m³
• E) The density cannot be determined without knowing the volume.

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