Assume the average value of the vertical component of Earth's magnetic field is 43 T (downward) for

Question:

Assume the average value of the vertical component of Earth's magnetic field is 43 µT (downward) for all of Arizona, which has an area of 2.95 × 105 km2. What then are the
(a) Magnitude and
(b) Direction (inward or outward) of the net magnetic flux through the rest of Earth's surface (the entire surface excluding Arizona)?