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AMU Medical AMU Solved Paper-1995

  • question_answer
    A magnet 20 cm long and having a pole strength of 5 units is deflected through\[30{}^\circ \]from the magnetic meridian. If the earths magnetic field is 0.32 oersted, value of the deflecting couple will be, in dynes cm.

    A)  16                

    B)  8

    C)  4                 

    D)  2

    Correct Answer: A

    Solution :

    : Deflecting couple on magnet \[=MH\sin \theta =(2lm)H\,\sin \theta \] \[=(20\times 5)\times 0.32\times \sin 30{}^\circ \] \[=\frac{100\times 0.32\times 1}{2}=16\text{ }dyne\text{ }cm.\]


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