If in the circuit below, find

$($a$)$ open circuit voltage

$($b$)$ downward current in a short circuit from a to b

$($c$)$ Thevenin equivalent impedance

$($a$)=$

$0$

$0$

V$($b$)=$

$0$

$0$

A$($c$)=$

$0$

$+$ j

$0$