JEE Main & Advanced Physics Magnetism Question Bank Magnetic Equipments

  • question_answer When 2 amperes current is passed through a tangent galvanometer, it gives a deflection of 30o. For 60o deflection, the current must be                                                        [MP PMT 2001]

    A)            1 amp                                     

    B)            \[2\sqrt{3}\,amp\]

    C)            4 amp                                     

    D)            6 amp

    Correct Answer: D

    Solution :

               \[i\propto \tan \varphi \Rightarrow \frac{{{i}_{1}}}{{{i}_{2}}}=\frac{\tan {{\varphi }_{1}}}{\tan {{\varphi }_{2}}}\] \[\Rightarrow \frac{2}{{{i}_{2}}}=\frac{\tan 30}{\tan 60}\Rightarrow {{i}_{2}}=6\ amp\]

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