The phase plot of an amplifier is shown in Fig XXXXXXXXXXThe amplifier has a midland gain of-1,000 and 3 zeros at co =-1,000 and 3 zero at =  three other unspecified poles. If the amplifier is...

The phase plot of an amplifier is shown in Fig. 31.67. The amplifier has a midland gain of-1,000 and 3 zeros at co =-1,000 and 3 zero at
= three other unspecified poles. If the amplifier is configured in a feedback configuration and ß is frequency independent, what is the exact value of ß that would be necessary to cause the amplifier to oscillate?