00:01
In this question, we are given that there's a 20 microfarrant capacitor.
00:06
It's made out of two spheres.
00:09
And then we want to find the volume in the region between the two spheres.
00:16
So we'll define here r1 and then r2 as the outer radius.
00:24
So to do this question, first we need to find why is r1 and r2.
00:33
And we are given that r2 equals to 2 r1.
00:39
Okay, alright, so using c equals to q over delta v, and then b is for spherical charge system would be k, q over r.
01:03
So delta v is kq times 1 over r1 minus 1 over r2 and then you have kq devibai 1 over r1 minus 1 over 2 r1 and you have kq over 2 r1 so if we put this into the formula for capacitance okay, so q over delta b we have q over kq times 2 r1 so we have 8 pi f s not not r1, right? and we are given the c is 20 micro ferret.
01:52
So you can calculate r1 to be c over 8 pi epsilon so 20 times 10 to the power negative 6, divided by 8 pi times 8 .85 times 10 to the power negative 12...