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NEET Sample Paper NEET Sample Test Paper-81

  • question_answer
    If 50 J of work must be done to move electric charge of 4 C from a place where potential is -10 V to another place where potential is V volt, the value of V is

    A)  5 V                             

    B)  2.5 V

    C)  1 V                             

    D)  0 V

    Correct Answer: B

    Solution :

    Suppose potential at point A is -10 V and potential at point B is V volt. Now, given \[{{W}_{AB}}\,\,=\,\,100\,J\] As,       \[{{\operatorname{W}}_{AB}}\,\,=\,\,q({{V}_{B}}-{{V}_{A}})\] \[50 =\,\,4 \left[ V-\left( -10 \right) \right]\] \[50 =4(V+10)\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\operatorname{V}=12.5 -10\] \[\operatorname{V} =\,\,2.5 V\]


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