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 4.8 x 108 m2 and has a height of 1500 m.

The magnitude of the magnetic field at a certain distance from a long, straight conductor is represented by b. what is the magnitude of the magnetic field at twice the distance from the conductor? a. at twice the distance, the magnitude of the field is 4b.b. at twice the distance, the magnitude of the field is 2b.c. at twice the distance, the magnitude of the field is b/2.d. at twice the distance, the magnitude of the field is b/4.e. at twice the distance, the magnitude of the field remains equal to b.