Physics-
General
Easy

Question

In figure, the switch S is closed so that a current flows in the iron-core inductor which has inductance L and the resistance R. When the switch is opened, a spark is obtained in it at the contacts. The spark is due to

  1. a slow flux change in L    
  2. a sudden increase in the emf of the battery B    
  3. a rapid flux change in L    
  4. a rapid flux change in R    

The correct answer is: a rapid flux change in L

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