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.


B

Physics & Space Science

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