A massive particle travels in a horizontal straight path through a uniform electric field in a vacuum, with the electric field acting vertically. The motion of the particle is affected significantly by gravity. What might be the direction of the electric field, and what sign, if any, does the charge on the particle have?
- Aelectric field downwards; sign of charge negative
- Belectric field downwards; sign of charge positive
- Celectric field upwards; sign of charge negative
- Delectric field upwards; no charge