(adsbygoogle = window.adsbygoogle || []).push({}); A positively charged oil drop of mass 1.00 × 10−15 kg is placed in the region of a uniform electric field between two oppositely charged, horizontal plates. The drop is found to remain stationary under the influence of the Earth's gravitational field and the uniform electric field of 0.680 × 104 N/C. What is the magnitude of the charge on the drop?

I am not sure where to start. I am given a mass so would I start with

U = -(G(m1)(m2))/r

Thanks in advance

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Magnitude of charge on oil drop (electric field)

**Physics Forums | Science Articles, Homework Help, Discussion**