force due to electric field is balanced by the force due to its own weight
[tex]F_g = F_e[/tex]
[tex]mg = qE[/tex]
here
m = 4.10 g
[tex]q = -18.4 \mu C[/tex]
now from the above equation we will have
[tex]4.10*10^{-3} * 9.8 = 18.4 * 10^{-6} * E[/tex]
[tex]E = 2183.7 N/C[/tex]
its direction is downwards along the direction of gravity as its a negative charge given here.
