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Question

Consider the circuit shown in the figure below.

The circuit is a current amplifier circuit with amplification factor AI=ILIi=21. If the op-amp is ideal then the value of resistance R is equal to

A
1.5 kΩ
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B
1 kΩ
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C
500 Ω
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D
2 kΩ
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Solution

The correct option is C 500 Ω

now, from the figure it is clear that,
I1(10 kΩ)=I2R [whereI1=Ii]
also, I1+I2=IL
I1×10 kΩ=(ILI1).R
10 kΩ=[ILII1]R
R=500 Ω

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