For the circuit given below will acts as a others inverter

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For the circuit given below will acts as a others inverter if:

1. R₁ > R_f
2. R₁ < R_f
3. R₁ = R_f
4. None of these

Correct Option: C

From given circuit

V_o = –	R_f	. V_i
	R₁

the circuit will act as a phase inverter if
V_o = – V_i, which is possible only when
R_f = R₁ V