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एक वृत्ताकार कुंडली में तार के 100 फेरे हैं तथा उससे होकर गुजरनेवाला चुंबकीय फ्लक्स 0.10 Wb हैं । यदि यह फ्लक्स `(1)/(10)s` में एकसमान दर से घटकर शून्य हो जाता हैं तो कुंडली में प्रेरित विद्युत - वाहक बल की गणना करें ।

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यदि कुंडली में प्रेरित विद्युत - वाहक बल `epsi` हो , तो
`therefore epsi = -N (Delta varphi)/(Delta t)` [ समीकरण 4.7 से ]
यहाँ , N = 100 , `Delta varphi = (0 - 0.10)Wb = - 0.10 Wb` तथा ` Delta t = (1)/(10)s`.
`therefore epsi = -100 xx (-0xx10 Wb)/((1)/(10)s) = 100 V.`
अतः , कुंडली में प्रेरित विद्युत - वाहक बल 100 V.

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