railway DFCCIL Executive 2025 Mock Test Electronic Devices Optical Devices Photodetectors

OP-AMP का प्रयोग करते हुए एक आधारभूत परिपथ संबंधन नीचे दर्शाया गया है। Vo का मान क्या है ?

1
\(\rm -\frac{R_f}{R_1}\)
2
\(\rm \frac{R_f}{R_1}\)
3
\(\rm -\frac{R_f}{R_1}V_i\)
4
\(\rm -\frac{R_f}{R_1}\frac{1}{V_i}\)
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