The energy stored per unit volume in a magnetic field $B = 0.1$ T in v…

Question

The energy stored per unit volume in a magnetic field $B = 0.1$ T in vacuum (take $\mu_0 = 4\pi 	imes 10^{-7}$ N/A²) is approximately:

Accepted Answer

A. $4.0 	imes 10^{3}$ J/m³

$u_B = B^2/(2\mu_0) = (0.1)^2 / (2 	imes 4\pi 	imes 10^{-7}) = 0.01 / (2.51	imes10^{-6}) \approx 3.98 	imes 10^3$ J/m³ ≈ 4 kJ/m³.

Answer

$8.0 	imes 10^{0}$ J/m³

Answer

$1.59 	imes 10^{-3}$ J/m³

Answer

$1.0 	imes 10^{-6}$ J/m³

The energy stored per unit volume in a magnetic field $B = 0.1$ T in vacuum (take $\mu_0 = 4\pi \times 10^{-7}$ N/A²) is approximately: