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J & K CET Engineering J and K - CET Engineering Solved Paper-2008

  • question_answer
    The electric flux through a closed surface area S enclosing charge Q is \[\phi \]. If the surface area is doubled, then the flux is

    A)  \[2\,\phi \]             

    B)  \[\phi /2\]

    C)  \[\phi /4\]             

    D)  \[\phi \]

    Correct Answer: A

    Solution :

    By Gauss' theorem \[{{\phi }_{E}}=\int{{\vec{E}}}.d\,\vec{S}=\frac{q}{{{\varepsilon }_{0}}}\] \[{{\phi }_{E}}\propto \int{dS}\] \[\therefore \]  Flux will also doubled, ie, \[2\phi \].


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