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1. Electric charges and fields — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics1. Electric charges and fields1 Mark
MCQ
Two identical conducing spheres having unequal positive charges $q_1$ and $q_2$ separated by distance $r$. If they are made to touch each other and then separated again to the same distance. The electrostatic force between the spheres in this case will be (neglect induction of charges)
  • A
    Less than before
  • B
     Same as before
  • ✓
    More then before
  • D
    Zero
✓

Answer

Correct option: C.
More then before
c
$\mathrm{F}_{1} \propto \mathrm{q}_{1} \mathrm{q}_{2}$

$\mathrm{F}_{2} \propto\left(\frac{\mathrm{q}_{1}+\mathrm{q}_{2}}{2}\right)^{2}$

So $\mathrm{F}_{2}>\mathrm{F}_{1}$

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