Hi can someone help me with this problem?
A thin disc of radius 60 cm has a hole its center of radius 30 cm. A total charge of
10^-3C is distributed uniformly on its surface. Find E at a point P which is 10 cm. on the central axis of this disc.
What would be the acceleration of an electron...
Sure!
I let them equal each other and I get:
3/b^2=2/(a-b)^2
then I did:
1. (3/b^2)-(2/(a-b^2))=0
2.(3(a-b)^2)-2b^2 / (b^2)((a-b)^2) =0
3. 3(a^2-2ab+b^2) - 2b^2 / b^2((a-b)^2)=0
4. 3a^2 - 6ab + b^2 / b^2(a^2 - 2ab +b^2)=0
I really don't know how to isolate b from here...
I was wondering if someone could help me with this question:
A charge 3q is at the origin, and a charge -2q is on the positive x-axis at x = a. Where would you place a third charge so it would experience no net electric force?
I currently set up two equations:
1. 3q*q/b^2 where b is...