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JEE Main & Advanced JEE Main Solved Paper-2014

  • question_answer
    Assume that an electric field \[\vec{E}=30{{x}^{2}}\hat{i}\]exists in space. Then the potential difference \[{{V}_{A}}-{{V}_{O}},\]where\[{{\text{V}}_{\text{O}}}\]is the potential at the origin and \[{{\text{V}}_{\text{A}}}\] the potential at x = 2 m is :   JEE Main  Solved  Paper-2014

    A) 80 J        

    B) 80 J

    C) 120 J                     

    D)  −120 J

    Correct Answer: A

    Solution :

                    \[\vec{E}=30{{x}^{2}}\hat{i}\] \[{{V}_{A}}-{{V}_{B}}=-\int\limits_{0}^{2}{30{{x}^{2}}.dx}=-80J\]                                


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