Indian Institute of Space Science and Technology interview questions

What is the difference between slew rate and bandwidth? Why is negative feedback used in amplifiers? What happens when an op-amp is used without feedback? Explain the concept of virtual ground. Why is a capacitor open circuit for DC and short circuit for AC? What is the gain-bandwidth product of an op-amp? What causes instability in feedback amplifiers? What is phase margin and why is it important? Explain the working of a differential amplifier.