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NEET Sample Paper NEET Sample Test Paper-69

  • question_answer
    Five very long, straight wires are bound together to form a small cable. Currents carried by the wires are\[{{I}_{1}}=20\,A,\,\,\,{{I}_{2}}=-6\,A,\,\,\,{{I}_{3}}=12\,A,\,\,{{I}_{4}}=-7A,\,\,{{I}_{5}}=18\,A\]. The magnetic induction at a distance of 10 cm from the cable is

    A) \[34\,\,\mu T\]               

    B) 74 mT

    C) 34 mT              

    D) \[74\,\,\mu T\]

    Correct Answer: D

    Solution :

    \[{{i}_{net}}=\,\,20-6+12-7+18=37\,\,A\,\,so\,\,B=\frac{{{\mu }_{0}}}{4\pi }\cdot \frac{2i}{a}\] \[=\,\,{{10}^{-7}}\times \frac{2\times 37}{10\times {{10}^{-2}}}=74\times {{10}^{-6}}\,T=74\,\mu T\]


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