Which of the following phenomenon makes use of electromagnetic induction

Options :
  1. magnetizing an iron piece with a bar magnet
  2. magnetizing a soft iron piece by placing it inside a current carrying solenoid
  3. charging a storage battery
  4. generation of hydroelectricity
Answer and Explanation :-

Answer: Option 4

Explanation:

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It is not given to us to know what difference we can make, and perhaps we can make no difference at all. But that is no reason not to make the attempt," said Saliman quietly. "The Light shines more brightly in the darkness.
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