$m$ દળ અને $q$ વિદ્યુતભાર ધરાવતી એક ગોળીને $R$ ત્રિજ્યા અને કુલ $+q$ વિદ્યુતભાર ધરાવતા સમાન રીતે વિદ્યુતભારીત નક્કર ગોળા તરફ છોડવામાં આવે છે. જો તે $u$ ઝડપ સાથે ગોળાની સપાટી પર અથડાય,તો ગોળામાંથી પસાર થવા માટે જરૂરી લઘુત્તમ ઝડપ $u$ શોધો. (સ્થિત વિદ્યુત બળો સિવાય ગોળી પર લાગતા તમામ અવરોધક બળો અથવા ઘર્ષણને અવગણો.)

  • A
    $\frac{q}{\sqrt{2\pi\varepsilon_0 mR}}$
  • B
    $\frac{q}{\sqrt{4\pi\varepsilon_0 mR}}$
  • C
    $\frac{q}{\sqrt{8\pi\varepsilon_0 mR}}$
  • D
    $\frac{\sqrt{3}q}{\sqrt{4\pi\varepsilon_0 mR}}$

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