Your error is that you shouldn't set equal to the zero vector (in fact this has no solutions). All you need to do is set the -component to zero so that lies on the j-axis.
We ignore the j-component, and obtain the equation
Your error is that you shouldn't set equal to the zero vector (in fact this has no solutions). All you need to do is set the -component to zero so that lies on the j-axis.
We ignore the j-component, and obtain the equation