alleryStart learning →For non-inverting amplifier (input to + terminal, R_in & R_f resistor divider): gain:
A-R_f/R_in
B1 + R_f/R_in (always > 1, no inversion)
CJust R_f
DR_in/R_f
Answer & Solution
Correct answer: B. 1 + R_f/R_in (always > 1, no inversion)
**Non-inverting:** V- = V+ = V_in.
R_in & R_f divider sets V- = V_out × R_in/(R_in+R_f).
**Equate:** V_out = V_in (1 + R_f/R_in).
Gain ≥ 1. Buffer (voltage follower): R_in = ∞, R_f = 0, gain = 1.
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