The main cause of alternating voltage induced in the secondary coil of a transformer is

Options :
  1. iron core of transformer
  2. varying magnetic field
  3. varying electric field
  4. vibrations of primary coil
Answer and Explanation :-

Answer: Option 2

Explanation:

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Why do they always teach us that it's easy and evil to do what we want and that we need discipline to restrain ourselves? It's the hardest thing in the world--to do what we want. And it takes the greatest kind of courage. I mean, what we really want.
-Ayn Rand