In the circuit of Figure, Ammeter $${A_2}$$ reads $$12$$ $$A$$ and $${A_3}$$ reads $$9$$ $$A.$$ $${A_1}$$ will read ______

At resonance, the given parallel circuit constituted by an iron - cored coil and a capacitor behaves like

In the following circuit (Fig.) $$i(t)$$ under steady state is

The following circuit (Fig.) resonates at