In the circuit shown below what is the output voltage (Vout)

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In the circuit shown below what is the output voltage (V_out) in Volts if a silicon transistor Q and an ideal op-amp are used?

1. – 15
2. – 0.7
3. + 0.7
4. +15

Correct Option: B

I = I, e I = I₀e ^{V_RE / V_T} , I = I₀e ^{-V₀ / V_T}

-V₀ = V_T		ln	I		= V_T ln		I₃ms
			I₀				I_s

V₀ = - 0.7
R_L = √R_s² + X_s² = √4² + 3² = 5