Answer:
Charge,
and it is negative.
Explanation:
Given that,
Mass of the charge, 
Electric field, E = 640 N/C
To find,
Charge
Solution,
The electric force and the force of gravity are balanced in the electric field. It is given by :




Since, the electric field is in downward direction. The force must be upward direction s that the charge is negative.
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Hope this helps