Consider the circuit shown in the figure below.

$A op-amp circuit is used to drive a voltage controlled current source which drains a current of I_{L} = 10 A and the value of β = 4 . If the op-amp supplies a current of -0.75 mA, then the value of input voltage V is equal to ______V.$
-1.5

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Solution

The correct option is A -1.5

$Now, 4 V_{i} = 10 A$
$Given, V_{i} = 2.5 V$
$I = \frac{2.5}{5 k Ω} = 0.5 mA$
$\frac{V - 0}{6 k Ω} + \frac{2.5 - 0}{10 k Ω} = 0$
$∴ V = - 1.5 V$

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