**1. The problem statement, all variables and given/known data**

Here is the Task:

The solar wind streams off of the sun in all directions at Speeds of about 400 km/s.

It contains roughly equal number of electrons and Protons.

Near the earth we find in a cube with a side length of 1 m about 8.7 * 10^6 Protons. The velocity of These Protons is 470 km/s.

Find the electric current produced by the flow of These Protons through a cross-sectional area of 1 m^2.

**2. Relevant equations**

The solution should be: 6.6 * 10^(-7)

**3. The attempt at a solution**

I really don’t have an idea how to integrate the solar wind into my equation.

Why is

(8.7 * 10^6 * 1m^2 * (1.6 * 10^(-19)) / 470 000 m/s

wrong?

What has the solar wind to do with that cube?

Can someone please help me and give me some tips?

Thanks in advance!

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