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किसी परिपथ में `0.1` सेकण्ड में धारा `5.0` ऐम्पियर से `0.0` ऐम्पियर तक गिरती है । यदि औसत प्रेरित विधुत वाहक बल 200 वोल्ट है , तो परिपथ में स्वप्रेरकत्व का आकलन कीजिए ।

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प्रेरित विo वाo बल `e = - L (Deltai)/(Deltat)`
अथवा `L = - (e )/(Deltai//Deltat) = - (200)/(((0.0 - 5.0))/(0.1)) = 4 "हेनरी"`।

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