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Help needed for assignment

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simie02

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please help me for question c and d. How do i calculate when resistor value is not given? Pls pls help me. Thanks
 

c. Do it using the variables themselves... I do not think he is asking for a number. The answer can only be an equation.

d. Voltage at collector of V1 = 15v when R4 is open. Here when R4 is open, the transistor is in cutoff mode. So no Ic (collector current). So there will be no voltage drop in R3.
 

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