Video narration
Maan lijiye aap chumbak ka uttari dhruv kundali ki or la rahe hain. Kundali ke bhitar flux badh raha hai. Prerit dhara aisa chumbakiya prabhav banati hai jo is badhat ko rokne ki koshish kare - kundali ka paas wala sira uttari dhruv jaisa vyavahar karega aur aate hue chumbak ko dhakelega. Jab aap chumbak door khinchte hain, flux ghatta hai. Ab prerit prabhav us ghatav ka virodh karta hai, isliye kundali chumbak ko vapas khinchne ki koshish karti hai. Yah virodh zaruri hai. Yadi prerit dhara badlav ko aur badhane lage, to ek chhota-sa dhakka apne aap adhik urja banata jata. Urja bina srot ke mil jati. Lenz's law aisa hone nahin deta; aapko chumbak chalane mein kaam karna padta hai, aur vahi urja vidyut roop mein aati hai. Yahi siddhant generator mein kaam karta hai: kundali ya chumbak ko ghumakar flux lagatar badla jata hai. Transformer mein bhi badalta chumbakiya kshetra doosri kundali mein voltage paida karta hai. Sthir kshetra, sthir vyavastha mein, bas sthir rahta hai - voltage nahin banata. Yaad rakhne ki baat bas itni hai: badalta chumbakiya flux voltage banata hai, aur Lenz's law us prerit prabhav ko usi badlav ke virodh mein rakhta hai.