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## Homework Statement

Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 8.60 cm-3 and their speed is about 490 km/s.

(a) Find the current density of these protons.

6.74E-7 A/m^2

(b) If Earth's magnetic field did not deflect the protons, what total current would Earth receive?

## Homework Equations

J=I/A

## The Attempt at a Solution

Using the equation above i used J*A=I, the problem is the area is used for the earth is apparently wrong(as i know my J is correct), so i looked online for it again and found 2 more answers(all the same numbers but to different powers of 10). Anyone know the actual surface area of the earth?(i would try plugging on all the ones i find but im limited on attempts for this question and i already used 2/5 of my tries)