Finding R3(max) of this circuit

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In summary, to find R3(max), use the formula R3(max) = (V(upper rail) - V3(lowest possible value of active mode)) / I, where V(upper rail) is 12V and I is 1mA. The V3(lowest possible value of active mode) can be found using the voltage divider rule, but the problem does not specify the value of V3.
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Homework Statement


Find R3(max)

Resistors are in Kilo ohms unless stated otherwise like 1.8M

http://imageshack.us/photo/my-images/265/capturesi.png/

Homework Equations


R3(max) = (V(upper rail) - V3(lowest possible value of active mode)) / I

The Attempt at a Solution



I know Vupperrail is 12 and I is 1mA but I do not know how to find the V3(lowest possible value of active mode).
I have worked the whole problem except the R3(max) part
 
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.I think the V3(lowest possible value of active mode) is found by the voltage divider rule, but I am not sure since the problem does not state what V3 is.
 

FAQ: Finding R3(max) of this circuit

What is the purpose of finding R3(max) in this circuit?

Finding R3(max) allows us to determine the maximum resistance that can be added to the circuit without affecting its overall performance or functionality.

How is R3(max) calculated in this circuit?

R3(max) can be calculated using the formula R3(max) = V/I, where V is the voltage across R3 and I is the current flowing through it.

What factors can affect the value of R3(max)?

The value of R3(max) can be affected by the voltage and current sources in the circuit, as well as the other resistors and components connected to it.

What happens if R3 exceeds the value of R3(max)?

If R3 exceeds the value of R3(max), it can cause the circuit to malfunction or even lead to damage of the components. It is important to always stay within the limit of R3(max) to ensure proper functioning of the circuit.

Can R3(max) be different for different types of circuits?

Yes, R3(max) can vary for different types of circuits as it depends on the specific components and their configurations within the circuit. It is important to calculate R3(max) for each circuit individually.

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