All help will go towards a quicker release of my first portable.
1) The Earth has an electric field around it, similar to that around a positively charged sphere. It's magnitude at the surface of the Earth is about 100.0 N/C. What charge would an oil drop have to be suspended by the Earth's electric field if the drop has a mass of 2.00 x 10^-15 kg? Give your answer in elementary charges.
2) An argon nucleus is placed above another argon nucleus such that it remains suspended above it. How far apart are they?
3) 2 Alpha particles are fired at each other at 0.0025c. What is their distance of closest approach?
4) An alpha particle starts at rest between two parallel plates with 2000.0 V applied to it. What speed would it have at the negative plate if a) it starts at the positive plate? b) if its tarts midway?
5) A pith ball of mass 1.0 x 10^-5 has a positive charge of 0.40 micro coulombs and is at rest. It is slowly pulled by a string 50 cm through a potential difference of 800.0V. The pith ball is then released where it returns back to its original position. Find:
a) The work done by the string to move the pith ball.
b) the average force required to perform this work
c) the kinetic energy with which the pith ball attains as it returns back to its starting point.
d) its speed upon return to the starting point.
6) Two electrons are held at rest, 10^-12m apart and released. What is each of their kinetic energy and speed at a very large distance apart?
You can still do these if you want, but through a quick google search of the first question, I found a PDF with all the solutions in it.
