What is the magnitude of a point charge ...

What is the magnitude of a point charge due to which the electric field 30 cm away has the magnitude 2 newton / coulomb ? `[1/(4piepsilon_0)=9xx10^9 (Nm^2)/C^2]`

`2xx10^-11C`

`3xx10^-11C`

`5xx10^-11C`

`9xx10^-11C`

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