Hello guys

I need help with these three questions

1- Indicate typical applications for the amplifier with low pass cahractersitics ?

2- Indicate typical applications for the amplifier with high pass cahractersitics ?

3- why is it necessary to operate in the negative-feedback mode ?

thanks a lot

 

I think these questions are directly relating to the subject you are studying.
We can make a guess,but it would only be a guess,unless you give us some idea where the questions come from,& what answers
you have already worked out yourself.