- #1
gsingh2011
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Homework Statement
I had a question in my physics class today that was relatively easy but what I was confused about was a misplaced negative sign. "An electron is rotating around a proton at a distance R. The mass of the electron is me and the charge is -e. Find the period."
Homework Equations
Fc=mev2/R
FE=kq1q2/R2
T=2pi*r/v
The Attempt at a Solution
The solution was calculated equating the two equations given above. The problem arises when I plug in -e and +e for the charges. This leaves one side of the equation negative, which results in a negative period. How does the negative sign go away? Do I not include the sign for charges?