NEET Sample Paper NEET Sample Test Paper-9

  • question_answer A charged ball hangs from a silk thread of length l.  It makes an angle \[\theta \] with a large charged conducting sheet P as shown in the figure. The surface charge density \[\sigma \] of the sheet is proportional to:

    A)  \[\cos \theta \]                         

    B)  \[\cot \theta \]

    C)  \[\sin \theta \]                         

    D)  \[\tan \theta \]

    Correct Answer: D

    Solution :

    From the diagram,             \[T\sin \theta =\frac{q\sigma }{2{{\varepsilon }_{0}}}\] and  \[T\cos \theta =mg\] \[\Rightarrow \]               \[\tan \theta \times \sigma \]

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