Mathematics · Percentages

एक कुंडली (coil) में प्रवाहित होने वाली धारा में कितने प्रतिशत वृद्धि की आवश्यकता है ताकि कुंडली में संचित चुंबकीय ऊर्जा दोगुनी हो जाए?

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