NEET Sample Paper NEET Sample Test Paper-19

  • question_answer 26) A galvanometer is connected to the secondary coil. The galvanometer shows an instantaneous maximum deflection of 7 divisions when a current is started in the primary coil of the solenoid. Now, if the primary coil is rotated through \[180{}^\circ C\], then the new instantaneous maximum deflection will be:

    A)  7 divisions,                

    B)  14 divisions.

    C)  0 divisions,                   

    D)  21 divisions.

    Correct Answer: B

    Solution :

    When the coil is rotated through \[180{}^\circ C\], the flux changes from \[\Phi \]to\[-\Phi \] Hence change in flux is \[\Phi -(-\Phi )=2\Phi .\]Further \[\Phi =Mi\] \[\therefore \]change in current =2i This cause a deflection of 14 divisions Hence, the correction option is [b].

adversite



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