An oil drop carrying a charge q has a ma...

An oil drop carrying a charge q has a mass m kg. it is falling freely in air with terminal speed v. the electric field required to make, the drop move upwards with the same speed is

`2xx10^3V//m`

`4xx10^3V//m`

`3xx10^3V//m`

`8xx10^3V//m`

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