In the figure shown, the value of the current I (in Amperes) is __________.

For the Y-network shown in the figure, the value of R₁ (in Ω) in the equivalent ∆ -network is ________.

In the circuit shown in the figure, the value of node voltage V₂ is

In the circuit shown in the figure, the angular frequency $$\omega$$ (in rad/s), at which the Norton equivalent impedance as seen from terminals b-b' is purely resistive, is _______.