Multiple choice

The input resistance Ri of the amplifier shown in the figure is

  1. $\frac{30}{4} k \Omega$
  2. 10 k$\Omega$
  3. 40 k$\Omega$

  4. infinite
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Since the inverting terminal is at $\pi$ virtual ground, the current flowing throught the voltage source is

$$ dkfhdkjfh$$

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