A beam of charged particles is bent by an electric field. When the conditions are the same, the angle through which a particle is deflected is proportional to its charge/mass ratio. In one experiment, protons are deflected through an angle of $+15^{\circ}$. In a second experiment under the same conditions, particle Y is deflected through an angle of $-5^{\circ}$. What could particle Y consist of?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct