The circuit of fig. uses an ideal OP_Amp for small positive values of V_in, the circuit works as

Assume that the operational amplifier in figure is deal the current I through the IK ohm resistor is

The JFET in the circuit shown in fig. has an I_DSS = 10mA and V_p = -5V. The value of the resistance R_s for a drain current I_DS = 6.4mA is (select the Nearest value).

If the transistors in fig. has high value of β and a v_BE of 0.65, the current I flowing through the 2 kilo ohms resistance will be ______.