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.
Correct Answer:
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