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

  • question_answer
    The work done in bringing at a unit positive charge from infinity distance to a point at distance X from a positive charge Q is W. Then the potential \[\phi \] at that point is

    A)  \[\frac{WQ}{X}\]

    B)  \[W\]

    C)  \[\frac{W}{Q}\]

    D)  \[WQ\]

    Correct Answer: C

    Solution :

    Potential at a point in a field is defined as the amount of work done in bringing a unit positive test charge, from infinity to that point along any arbitrary path, ie, \[V=\frac{W}{{{q}_{0}}}\] \[\therefore \] \[V=\phi =\frac{W}{Q}\] \[[\because \,\,X<<\infty ]\]


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