What is the sign of the charge of the particle?

Question

A particle of mass 1.1454X10^-25 kg. and charge of magnitude 4.8 x 10^-19 C is accelerated from rest in the plane of the page through a potential difference of 218 V between two parallel plates. The particle is injected through a hole in the right-hand plate into a region of space containing a uniform magnetic field of magnitude 0.138 T oriented perpendicular to the plane of the page. The particle curves in a semicircular path and strikes a detector. What is the sign of the charge of the particle? Neglect relativistic effects.
1. The charge cannot be determined for info given.
2. The charge q is negative.
3. The charge q is positive.

Answer 1

It says the charge has a magnitude of 4.8 x 10^-19 Coloumbs - therefore the charge is positive. The number may be tiny but that it still a +ve charge.

So I would say Answer 3. (seen as though I teach this stuff!!)

Answer 2

1, I think you need to know which charge on each plates. May be theres way to figure it out with that magnetic field outside. I'm not sure.

Answer 3

To hell i hated those things