I can\'t figure out what formula to use for this question whensuch little info i

Question

I can't figure out what formula to use for this question whensuch little info is given. The mass doesn't matter doesit?
a small object of mass 3.80 g and charge -18 microC "floats"in a uniform electric field. what is the magnitude and direction ofthe electric field? I can't figure out what formula to use for this question whensuch little info is given. The mass doesn't matter doesit?
a small object of mass 3.80 g and charge -18 microC "floats"in a uniform electric field. what is the magnitude and direction ofthe electric field?

Explanation / Answer

a small object of mass 3.80 g and charge -18 microC "floats"in a uniform electric field. what is the magnitude and direction ofthe electric field?
here on this smll body there are two forces acting .
1)gravitational force 2)electric force when these two are equal in magnitude and opposite to thedirection the object floats. so 3.8*10-3*9.8=E*18*10-6[as perEq=F] calculating for E it is 2068N/C

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