P32 004

background image

4. The flux through Arizona is

Φ =

−B

r

A =

(43 × 10

6

T)(295, 000 km

2

)(10

3

m/km)

2

=

1.3 × 10

7

Wb ,

inward. By Gauss’ law this is equal to the negative value of the flux Φ



through the rest of the surface

of the Earth. So Φ



= 1.3

× 10

7

Wb, outward.


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