If current of 20 mA is passing through op-amp and voltage drop across series resistor is 10 V then value of resistance is

If current of 20 mA is passing through op-amp and voltage drop across series resistor is 10 V then value of resistance is
  • A. 500Ω
  • B. 400Ω
  • C. 300Ω
  • D. 200Ω
  • Correct Answer: Option A
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