A charged particle of mass 0.003 g is he...

A charged particle of mass 0.003 g is held stationary in space by placing it in a downward direction of electric field of `6xx10^(4)NC^(-1)`. Then, the magnitude of charge is

`5xx10^(-4)C`

`5xx10^(-10)C`

`-18xx10^(-6)C`

`-5xx10^(-9)C`

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