Inthe circuit shown below, the op-amp is ideal, the transistor has VBE = 0.6 V and andbeta;= 150. Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of op-amp.a)Positive feedback,V = 10Vb)Positive feedback,V = 0Vc)Negative feedback,V = 5 Vd)Negative feedback,V = 2 VCorrect answer is option 'D'. Can you explain this answer?

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In the circuit shown below, the op-amp is ideal, the transistor has V_BE = 0.6 V and β = 150. Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of op-amp.

a)
Positive feedback, V = 10V
b)
Positive feedback, V = 0V
c)
Negative feedback, V = 5 V
d)
Negative feedback, V = 2 V

Correct answer is option 'D'. Can you explain this answer?

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Inthe circuit shown below, the op-amp is ideal, the transistor has VBE...

Voltage at inverting terminal V_B = 5 V. Ideal op-amp has infinite input resistance so there will be no current pass through the op-amp. So V_A and V_B will be virtual grounded, V_A = V_B =5V.

Since, V_C= VA = 5 V

Here given p is very large, so I_C

I_E = 1 mA
V' = 1.4 x 10³ x 1 x 10^-3 = 1.4 V
Therefore, output voltage V = V' + V_BE=1.4 + 0.6 = 2V
There is no need to check positive or negative feedback because 2V is available only in option (d).

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Inthe circuit shown below, the op-amp is ideal, the transistor has VBE = 0.6 V and β= 150. Decide whether the feedback in the circuit is positive or negative and determine the voltage V at the output of op-amp.a)Positive feedback,V = 10Vb)Positive feedback,V = 0Vc)Negative feedback,V = 5 Vd)Negative feedback,V = 2 VCorrect answer is option 'D'. Can you explain this answer?

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