A square loop, side a, resistance R, lies a distance s from an infinite straight wire that carries current I (Fig. 7.28). Now someone cuts the wire, so that I drops to zero. In what direction does the induced current in the square loop flow, and what total charge passes a given point in the loop during the time this current flows? If you don't like the scissors model turn the current down gradually:

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1 S a ={ 1 (t) = a (1-at)I, 0, @ for 0 ≤ ≤ 1/a, for t > 1/a.