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12th Class Physics Electrostatics & Capacitance Question Bank MCQ - Electrostatic Potential and Capacitance

  • question_answer
    If a charged spherical conductor of radius 10 cm has potential Vat a point distant 5 cm from its centre, then the potential at a point distant 15 cm from the centre will be:

    A) 2/3 V

    B) 3/2 V

    C) 3 V

    D) 1/3 V

    Correct Answer: A

    Solution :

    (a) 2/3 V Radius of sphere =1G cm Potential inside sphere is same as on its surface \[\therefore \,\,\,\,\,\,\,\,V=\frac{kq}{10}\]             … (1) Now, \[V'=\frac{Kq}{15}\]                      … (2) \[\frac{V}{V'}=\frac{kq}{10}\times \frac{15}{Kq}=\frac{3}{2}\] \[\Rightarrow \,\,\,\,\,\,\,\,V'=\frac{2}{3}V\]


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