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ताँबे के तार की एक कुण्डली को किसी चुम्बकीय क्षेत्र में एक निश्चित वेग से खींचा जाता है । यदि इसका ओमीय प्रतिरोध बढ़ा दिया जाये, तो क्या इसे खींचना आसान होगा ? यदि चुम्बकीय क्षेत्र की तीव्रता दोगनी हो जाये, तब ?

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हाँ , क्योकि प्रतिरोध बढ़ाने से प्रेरित धारा घट जाएगी , अतः कुण्डली को खींचने के लिए आवश्यक बल भी घट जायेगा । क्षेत्र दोगुना हो जाने पर बल चार लगाना होगा ।

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