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NEET Sample Paper NEET Sample Test Paper-79

  • question_answer
    A long solenoid carrying a current produces a magnetic field B inside it. If the current is doubled and the mini of turns is halved, the new value of magnetic field is

    A)  B                                

    B)  2B                  

    C)  \[\frac{B}{2}\]                         

    D)  None of these

    Correct Answer: A

    Solution :

    Magnetic field induction at point inside the solenoid is given by \[B={{\mu }_{0}}ni\] If i is doubled and n is halved \[B'={{\mu }_{0}}\left( \frac{n}{2} \right)\,(2i)\] \[=\,\,{{\mu }_{0}}ni\] \[\operatorname{B}'=B\]. So, magnetic field will remain same.


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