What is the magnetic energy density in a volume where the magnetic field is 4.0 mT? A) 3.2 $\times$ 10^-3 J/m³ B) 3.2 J/m³ C) 6.4 J/m³ D) 13 J/m³ E) 13 $\times$ 10^-3 J/m³

Question

Quizplus · Accepted Answer

The magnetic energy density is given by u = (1/2)B^2, where B is the magnetic field.
Substituting B = 4.0 mT = 4.0 × 10^-3 T, we get u = (1/2) × (4.0 × 10^-3)^2 J/m^3 = 6.4 × 10^-3 J/m^3 or 6.4 J/m^3 (approx). Therefore, the correct choice is C.

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