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NEET Sample Paper NEET Sample Test Paper-5

  • question_answer
    The distance between two thin long straight parallel conducting wires is b. On passing the same current i with same same sense in them, the force per unit length between them will be:

    A)  zero               

    B)  \[\frac{{{\mu }_{0}}{{i}^{2}}}{2\pi b}\]

    C)  \[\frac{{{\mu }_{0}}i}{2\pi b}\]                 

    D)  \[\frac{{{\mu }_{0}}i}{2\pi }\]

    Correct Answer: B

    Solution :

    The force of attraction per unit length of the wire \[\frac{F}{l}=\frac{{{\mu }_{0}}}{4\pi }\frac{2il}{b}=\frac{{{\mu }_{0}}{{i}^{2}}}{2\pi b}\]


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