A nullator is defined as a circuit element where the voltage across the device and the current through the device are both zero. A series combination of a nullator and a resistor of value, $R$, will behave as a

The number of junctions in the circuit is

In the given circuit, for voltage V_y to be zero, the value of β should be ______. (Round off to 2 decimal places).

Currents through ammeters A₂ and A₃ in the figure are 1∠10° and 1∠70°, respectively. The reading of the ammeter A₁ (rounded off to 3 decimal places) is _____ A.