In the below figure, find the output voltage, if the opamp is ideal

-7 V

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-6 V

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-1 V

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6 V

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Solution

The correct option is A -7 V
This op amp circuit is a summing amplifier. Since the input current will be zero(high impedance)
$I_{f} = \frac{v_{1}}{R_{1}} + v_{2} r_{2}] = \frac{3}{8} + \frac{2}{4} = 0.875 A$
$V_{0} = - i_{f} R_{f} = - 0.875 \times 8 = - 7 V$

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