Find the input voltage of an ideal op-amp. It‚Äö√Ñ√∂‚àö√ë‚àö¬•s one of the inputs and output voltages are 2v and 12v. (Gain=3)$#

Find the input voltage of an ideal op-amp. It‚Äö√Ñ√∂‚àö

1.	Find the input voltage of an ideal op-amp. It‚Äö√Ñ√∂‚àö√ë‚àö¬•s one of the inputs and output voltages are 2v and 12v. (Gain=3)$#
A.	8v
B.	4v
C.	-4v
D.	-2v
Answer» E.