-Refer to the figure above. If R2 opened, the value of IC would be
A)8 mA.
B)6 mA.
C)6.67 mA.
D)10 mA.

Question

-Refer to the figure above. If R2 opened, the value of IC would be
A)8 mA. 
B)6 mA. 
C)6.67 mA. 
D)10 mA.

Quizplus · Accepted Answer

With R2 open, the circuit simplifies to just R1 in series with the transistor's base-emitter junction. The base current (IB) can be calculated using Ohm's law (V = IR), where V is the voltage across R1. Assuming a base-emitter voltage (VBE) of approximately 0.7V for a silicon transistor, the voltage across R1 is 12V - 0.7V = 11.3V. The base current IB = 11.3V / R1. The collector current (IC) is related to the base current by the transistor's current gain (beta), typically given as IC = beta * IB. Without the exact values of R1 and beta, a precise calculation can't be made, but the concept is that the collector current would be determined by the base current and the transistor's characteristics, not directly by the values given in the options.

-Refer to the Figure Above