Feedback in a system occurs when outputs of a system are routed back as inputs .If in operational amplifier a negative feedback is given, the output is .
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When the feed back found at the time of output of system are routed back as the input as part of the chain of cause and effected the form as circuit or loop.
Thus systems can be said to feed back among themselves, even the out put will not constant and it may have chance to get vary with no risk and trouble of it.
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