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12th Class Physics Electric Charges and Fields Question Bank MCQ - Electric Charges and Fields

  • question_answer
    In a region where intensity of electric field is \[5\,N{{C}^{-1}}\]40 electric field lines are crossing per square metre. The number of electric field lines crossing per square metre where intensity of electric field is\[10\,N{{C}^{-1}}\], will be:

    A) 20                    

    B) 80     

    C) 100                              

    D) 200

    Correct Answer: B

    Solution :

    (b) 80 Number of lines of electric field crossing is equal to flux \[\left( \phi  \right)\]. We know that, \[\phi =\int{E\,.\,\,ds}\] By keeping area constant and doubling \[E,\,\phi \]will also get doubled. No. of lines \[=2\times 40=80\]


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