00:01
Find the magnitude and direction of the net magnetic fields.
00:05
So our net magnetic fields is going to be equal to the magnetic fields from the first wire plus our magnetic fields from the second wire.
00:14
And our direction is going to be the negative y axis, or pointing downwards.
00:20
Now, b1 is equal to mu not i1 divided by 2 pi r1, and then we add that to mu not i2 divided by 2 pi r2.
00:31
So our net magnetic fields is equal to mu not divided by 2 pi times i1, which is 3 amps, plus i2, which is 4 amps, divided by our r1 plus r1 plus r2.
00:49
So r1 is, it's going to be 8 centimeters.
00:52
So we have 8 plus i2 is going to be equal to, or r2 is going to be, we're told that they're 20 centimeters away from each other.
01:11
So they're going to be 20 centimeters away from each other.
01:24
So our distance are 1 away from point, our point...