PAKKA engineer - Concept of Capacitor

External  examiner: to an engineering student :

Why does a capacitor stops DC but allows AC to pass through?

 

Student : Sir, capacitor is like this  ---| |---

DC comes straight like this  ------ & the capacitor stops it.  But AC Goes UP-DOWN-UP-DOWN like this
   . --- .
.'          '.
----||-------||----.
              '.          .'
                ' --- '
and jumps over the capacitor!

External Examiner : After 30 years of experience.. today I understood the concept of capacitor