[单选题]
A Styrofoam ball of mass 0.120 g is placed in an electric field of/*qsej8rhjm5 ks rxt7*x1i*h 6000 N/C e7oj 15g.; wqatz5m ;wx297 hqrv uvrcpointing downward. What charge must be placed on the ball for it to be suspm9h;2v1jaw5gctoevqxwqr .7uz ;57rended?