Help with me with physics! The earth's magnetic field, like any magnetic field, stores energy...
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Help with me with physics! The earth's magnetic field, like any magnetic field, stores energy...

[From: ] [author: ] [Date: 12-11-19] [Hit: ]
The maximum strength of the earths field is about 7.0 x 10-5 T. Find the maximum magnetic energy stored in the space above a city if the space occupies an area of 7.5 x 106 m2 and has a height of 2100 m.µ_0 is a constant, and you have B,......
Please help me with this one out.

The earth's magnetic field, like any magnetic field, stores energy. The maximum strength of the earth's field is about 7.0 x 10-5 T. Find the maximum magnetic energy stored in the space above a city if the space occupies an area of 7.5 x 106 m2 and has a height of 2100 m.

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The energy density (energy per volume) u of a magnetic field is

u = B² / (2 µ_0)

µ_0 is a constant, and you have B, so you can find the energy density of the field per volume. Multiplying by the volume above the city will give you the total energy.

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As a matter of interest, SmartAZ, how can something be a philosophical concept except in nuclear physics? And saying energy is defined as a frequency doesn't make sense—the dimensions aren't the same.

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You're welcome. I'm glad to help.

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Energy is not a physical unit*, it is a philosophical concept. Except in nuclear physics where it is defined to be a frequency of light. Your question is wonky.

* Energy is sometimes defined as capacity to do work. But work is defined as disordering of energy. So energy is capacity to do disordering of energy, a circular definition.
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