Element 8 F question 45

Question:

Figure 8F12
8-45F4 In the circuit contained in Fig. 8F12, there are 5 volts present at points B and C, and there are zero volts present at points A and D. What is the voltage at point E?
 
A. 21.5 Volts. [correct answer]
B. 3.75 Volts.
C. 23.75 Volts.
D. 4.5 Volts.

Challenger's excerpt:

None

Response

With the inverting amplifier, we would expect to see a negative voltage at point E.  It appears during the act of retyping, the 2's were substituted for a negative sign.

formula

Recommendation:

Change question to:

figure 8F12
8-45F4 In the circuit contained in Fig. 8F12, there are 5 volts present at points B and C, and there are zero volts present at points A and D. What is the voltage at point E?
 
A. -1.5 Volts. [correct answer]
B.  3.75 Volts.
C. -3.75 Volts.
D.  4.5 Volts.