JEE Main & Advanced Sample Paper JEE Main Sample Paper-4

  • question_answer
    An uniformly charged infinite long wire carries linear charge density\[\lambda .\] The electric field at point P is

    A) \[\frac{\lambda }{4\pi {{\in }_{0}}d}\]                    

    B) \[\frac{\lambda }{2\pi {{\in }_{0}}d}\]

    C) \[\frac{\lambda }{\pi {{\in }_{0}}d}\]                      

    D)  can't be found

    Correct Answer: B

    Solution :

    For infinite long wire, the electric field at a point distant d from it is given by, \[E=\frac{\lambda }{2\pi {{\in }_{0}}d}\]

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