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NEET Sample Paper NEET Sample Test Paper-24

  • question_answer
    Three charges, each + q, are placed at the comers of an isosceles triangle ABC of sides BC and AC, 2a, D and E are the mid-points of BC and CA. The work done in talking a charge Q from D to E is

    A) \[\frac{eqQ}{8\pi \,{{\varepsilon }_{0}}a}\]                    

    B)  \[\frac{qQ}{4\pi {{\varepsilon }_{0}}a}\]

    C)  zero                             

    D)  \[\frac{3qQ}{4\pi {{\varepsilon }_{0}}a}\]

    Correct Answer: C

    Solution :

     Here, AC = BC As D and E are the mid points of BC and CA, the potential of these points should be equal. \[{{V}_{D}}={{V}_{E}}=V\] The work done in talking a charge Q from D to E \[W=Q[{{V}_{E}}-{{V}_{D}}]=Q[V-V]=0\]


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