00:01
Positive charge q is distributed uniformly around a very thin conducting ring of radius a.
00:06
You measure the electric field at points on the ring's axes at a distance x from the edge of the ring over a wide range of x.
00:17
Your results for the larger values of x are plotted in the figuring in your textbook.
00:23
As e versus x, explain why the quantity approaches a constant value as x increases.
00:36
Okay, so from the beginning, to use the equation of an electric field of a thin ring, we know that this is e is equal to k -qx over x squared plus a squared.
01:02
It's three halves, and as if we have the ring, the radius is a, you have p, you have p.
01:14
Is the positive x direction.
01:18
Okay, so at an infinite distance from the center, you have e is equal to kqx over x cubed, which is kq over x squared.
01:43
And this is the same as a point charge.
01:50
So we know ex squared is equal to, kk so k is a constant q is a constant which means e x squared is also a constant so we know e x squared is 45 so 45 is equal to k k k is kulms constant so we can solve for q which is 5 .0 10 to the negative 9th couloms so the greatest value that x squared can be is 45, and it tends to stay the same for greater values of x...