A small sphere with charge and mass $0.80\,\text{g}$ is suspended by a light thread in a vertical uniform electric field of magnitude $2000\,\text{V m}^{-1}$. The thread runs over two frictionless pulleys, and a mass of $2.00\,\text{g}$ is attached to the free end. The sphere is in equilibrium. What charge does the sphere carry?
- A$-5.9\,\mu\text{C}$
- B$+0.60\,\mu\text{C}$
- C$+5.9\,\mu\text{C}$
- D$+9.8\,\mu\text{C}$