Yes you a right. I am looking for Z and i already know it has to be an inductor. And my question is, why the impedance between a and b is infinite when putting in an iductor.
No it is not a homework, it is was in the examination last year.
So Z has to be L2 (i think) (complex): Z(all) = R1 +...
Summary:: So the question is, what do I need to do on clamp 'ab', so that the total current only goes through the Inductor L1.
I know the must be a second inductor parallel to the capacitor C1, but i don't know why.
Can someone please explain.
I also included the german question under the picture.