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J & K CET Engineering J and K - CET Engineering Solved Paper-2009

  • question_answer
    Electric flux emanating through a surface element \[\overrightarrow{ds}=5\hat{i}\] placed in an electric field \[\vec{E}=4\hat{i}+4\hat{j}+4\hat{k}\] is

    A)  \[10\text{ }units\]        

    B)  \[20\text{ }units\]

    C)  \[~4\text{ }units\]         

    D)  \[16\text{ }units\]

    Correct Answer: B

    Solution :

    Electric flux \[\phi =\vec{E}.\overrightarrow{ds}\] \[\therefore \] \[\phi =(4\hat{i}+4\hat{j}+4\hat{k})(5\hat{i})\] \[=20\,units\]


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