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AFMC AFMC Solved Paper-2010

  • question_answer
    A solenoid carrying a current supplied by a DC source with a constant emf contains iron rod inside it. When the rod is pulled out of the solenoid, then the current in the solenoid will

    A) increase                              

    B) decrease

    C) remain constant                              

    D) becomes zero

    Correct Answer: A

    Solution :

    Magnetic flux\[\text{o }\!\!|\!\!\text{ = LI = cosntant }\] As iron rod is brought out L (self induction will decrease) and hence, current will increase.


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