A) A ring with a 15cm radius and with a uniform charge of 20 microcoulombs is in

Question

A) A ring with a 15cm radius and with a uniform charge of 20 microcoulombs is in the yz-plane with the origin at its center. What isthe force on a -3 micro coulombs charge on the x-axis at x=5cm?
I tried to plug in the numbers for the above equations and can'tseem to get the right answer. I first solved for E and thenmultiplied it to Q which is -3*10^(-6) C...correct?
The answer should be -6.83 N, but I can't seem to figure itout.

B) How many electrons must be removed from a conducting sphere witha 3cm radius to make the electric field its surface 6000V/m?

C) Two electrons separated by 2*10^(-10) m are released from rest.What is the speed of each electron when they are a large distanceapart. (Both electrons should have the same speed.)



Thanks for the help. Will rate lifesaver!!!

Explanation / Answer

I figured part a & b out. Can anyone help me with c?

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