# I have been struggling with these two practice problems in the book, thanks for the help...

###### Question:

I have been struggling with these two practice problems in the book, thanks for the help in advance!

1. (22.4) Richard Feynman (1918-1988) once said if two people stood at arm's length from each other and each person had 1% more electrons than protons, the force of repulsion between them would be enough to lift a "weight equal to that of the entire Earth. Do an order-of- magnitude calculation to show this. Be sure to communicate assumptions and estimates. 2. (23.20) A particle with charge Q is located at the center of a cube with edges of length L Also, six other identical charged particles of charge q are positioned symmetrically around Q as shown in the figure below. Assume q is a negative number. Determine the electric flux through one face of the cube.

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