Question -
The intensity of the electric field required to keep a water drop of radius 10−5 cm, just suspended in air when charged with one electron is approximately (g = 10newton / kg, e=1.6×10−19 coulomb)
Options:
A .  260 volt / cm
B .  260 newton / coulomb
C .  130 volt / cm
D .  130 newton / coulomb
E .  If assertion is false but reason is true.
Answer: Option B : B For balance mg=eE⇒E=mge Also m=43πr3d=43×227×(10−7)3×1000kg ⇒E=4/3×22/7×(10−7)3×1000×101.6×10−19=260N/C
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