A small piece of dust of mass m = 1.4 g travels horizontally through an electric air cleaner in which the electric field is 495 N/C.

A small piece of dust of mass m = 1.4 g travels horizontally through an electric air cleaner in which the electric field is 495 N/C. The electric force on the particle is equal to the weight of the particle. What is the charge on the dust particle?