JEE Main & Advanced Physics Magnetic Effects of Current / करंट का चुंबकीय प्रभाव Question Bank Force and Torque on a Current Carrying Conductor

  • question_answer
    The coil of a galvanometer consists of 100 turns and effective area of 1 square cm. The restoring couple is \[{{10}^{-8}}\,N-m/radian\]. The magnetic field between the pole pieces is 5 T. The current sensitivity of this galvanometer will be                                                                                    [MP PMT 1997]

    A)            \[5\times {{10}^{4}}\,rad/\mu \,amp\]                        

    B)            \[5\times {{10}^{-6}}\,per\,amp\]

    C)            \[2\times {{10}^{-7}}\,per\,amp\]                                  

    D)            \[5\,rad/\mu \,amp\]

    Correct Answer: D

    Solution :

                       Current sensitivity \[\frac{\theta }{i}=\frac{NBA}{C}\]            \[\Rightarrow \frac{\theta }{i}=\frac{100\times 5\times {{10}^{-4}}}{{{10}^{-8}}}=5\ rad/\mu \ Amp\]


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