The energy stored in the earth's magnetic field with a strength of 0.5 × 10^-4 T in a room 3.0 m by 4.0 m by 2.4 m is A)570 mJ. B)29 mJ C)10 mJ. D)100 mJ. E)zero.

Question

Quizplus · Accepted Answer

The energy stored in a magnetic field is given by the formula: U = (B²/2μ₀) × Volume. Substituting B = 0.5 × 10⁻⁴ T, μ₀ = 4π × 10⁻⁷ T·m/A, and the volume of the room (3.0 m × 4.0 m × 2.4 m), we find the energy to be approximately 29 mJ.

The Energy Stored in the Earth's Magnetic Field with a Strength