The subsequent problems deal with the circuit below. Assume that when the transistor is in saturation, the collector-to-emitter drop is 0.2 V and the base-to-emitter forward bias voltage is 0.7 V. Assume that the forward bias voltage for the LED is 2 V.
If Vin=5V, what is the voltage at the base of the transistor?
A. 0.2 V
B. 0 V
C. 5 V
D. 0.7 V
E. 2.2 V
Answer: D
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