Consider the circuit shown in Figure P9.64. (a) The output current of the op-amp is 1.2 mA...

Consider the circuit shown in Figure P9.64. (a) The output current of the op-amp is 1.2 mA and the transistor current gain is β = 75. Determine the resistance R . (b) Repeat part (a) if the current is 0.2 mA and the transistor current gain is β = 100. (c) Using the results of part (a), determine

the op-amp output current if the input voltage is 6 V. (d) Using the results of part (b), determine the op-amp output current if the input voltage is 4 V.