A balanced three-phase \(240-\mathrm{V}\) source supplies a balanced three-phase load. If the line current \(I_{\mathrm{A}}\) is measured to be \(15 \mathrm{~A}\) and is in phase with the line-to-line voltage, \(V_{\mathrm{BC}}\), find the per-phase load impedance if the load is

(a) Y-connected,

(b) \(\Delta\)-connected.