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NEET Sample Paper NEET Sample Test Paper-64

  • question_answer
    A coil of\[40\,\,\Omega \], resistance has 100 turns and radius 6 mm is connected to ammeter of resistance of 160 ohms. Coil is placed perpendicular to the magnetic field. When coil is taken out of the field, \[32\,\mu C\] charge flows through it. The intensity of magnetic field will be

    A) 6.55 T              

    B) 5.66 T

    C) 0.655 T                        

    D) 0.566 T

    Correct Answer: D

    Solution :

    \[q=-\frac{N}{R}\,({{B}_{2}}-{{B}_{1}})\,A\,\cos \,\theta \] \[32\times {{10}^{-}}^{6}\] \[=-\frac{100}{(160+40)}\,\,(0-B)\times \pi \times {{(6\times {{10}^{-3}})}^{2}}\,\times \,\,cos\,0{}^\circ \] \[\Rightarrow \,\,B\,\,=\,\,0.565\text{ }T\]


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