49. ssm 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 5.0 x 108 m2 and has a height of 1500 m.

 

Energy stored in a magnetic field can be expressed as

 

 

 

 

 

 

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