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A (current vs time) graph of the current passing through a solenoid is shown in Fig . For which time is the back electromotive force (u) a maximum. If the back emf at t = 3s is e, find the back emf at t = 7 s, 15s and 40s. OA, AB and BC are straight line segments.

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A (current vs time) graph of the current passing through a solenoid is shown in Fig . For which time is the back electromotive force (u) a maximum. If the back emf at t = 3s is e, find the back emf at t = 7 s, 15s and 40s. OA, AB and BC are straight line segments.

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