A negatively charged dust grain is held stationary in a vertical electric field in an environmental chamber on Earth.
The specific charge of the dust grain is −3.27×10−4 C kg−1-3.27 \times 10^{-4}\text{ C kg}^{-1}−3.27×10−4 C kg−1.
Determine the magnitude and direction of the electric field required to keep the dust grain stationary.
Take the acceleration due to gravity, ggg, to be 9.81 m s−29.81\text{ m s}^{-2}9.81 m s−2.