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The intensity of the electric field requ...

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

A

`260 "Volt"//cm`

B

`260 "newton"//"coulomb"`

C

`130 "Volt"//cm`

D

`130 "newton"//"coulomb"`

Text Solution

Verified by Experts

The correct Answer is:
b
For balance `mg= eEimplies E=(mg)/(e )`
Also `m=(4)/(3)pir^(3)d= (4)/(3)xx(22)/(7)xx(10^(-7))xx1000 kg`
`implies E=(4//3xx22xx7(10^(-7))^(3)xx1000xx10)/(1.6xx10^(-19))=260 N//C`
`(g= 10 newton//kg= 1.6xx10^(-19) "coulomb")`
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