The zener diode has a V_z = 30V. The current passing through the diode for the following circuit is ________ mA.

The circuit contains two diodes each with a forward resistance of 50$$\Omega$$ and with infinite reverse resistance. If the battery voltage is 6V, the current through the 120$$\Omega$$ resistance is ____________ mA.

In connection with the circuit drawn below, the value of current flowing through 2 k$$\Omega$$ resistor is _________ $$\times$$ 10^$$-$$4 A.

The output characteristics of a transistor is shown in the figure.
When V_CE is 10V and I_C = 4.0 mA, then value of $$\beta $$_ac is __________.