1.

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 [MP PMT 1994]

A.            \[260\,volt/cm\]
B.                                      \[260\,newton/coulomb\]
C.                    \[130\,volt/cm\]
D.                                      \[130\,newton/coulomb\]            \[(g=10\,newton/kg,\,e=1.6\times {{10}^{-19}}coulomb)\]
Answer» C.                    \[130\,volt/cm\]


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