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The voltage gain of the following amplif...

The voltage gain of the following amplifier Fig. is 200. The value of input resistance `R_(i)` is

A

` 0.2 kOmega`

B

`0.5 kOmega`

C

`1 kOmega`

D

`2 kOmega`

Text Solution

Verified by Experts

The correct Answer is:
B
Fig. repersents an operational amplifier in inverting mode. In this amplifier,

`A_(V)=V_(0)/V_(i)=R_(f)/R_(i) or R_(i)=R_(f)/A_(V)=(100k Omega)/200=0.5 kOmega`
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