an amplifier with a low-frequency gain of 100 and poles at 10^4 rad/s and 10^6 rad/s is incorporated in a negative-feedback loop with feedback factors B. For what values of B do the poles of the closed-loop amplifier concide? what is the corresponding Q of the resulting second-order system? for what value of B is a maximally flat response achieved? what is the low-frequency closed-loop gain in the maximally flat case?