00:01
In this question we're given a current of i equals 2i plus 3j plus 4k.
00:10
So that should be minus 4k.
00:15
And we have the magnetic field is 3i minus 2j plus 6k.
00:24
And we want to find their cross product.
00:27
Well, the cross product of i and b is i'm going to write them as column vectors now, 2, 3, minus 4 crossed with 3 minus 2, 6.
00:42
And the formula for the cross product is that for the x component, we do this times this, minus this times this.
00:50
So that's 18 minus 8, so 10.
00:54
For the y component, we do minus 12, minus 12, so that's minus 24.
01:03
And then for the z component, we're going to do minus 4...