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|[[File:BetaParticleCharge.png|center|200px]]
| style="height:20px; width:400px; text-align:left;" |Scientist were able to determine the [[Electrical Charge|charge]] and [[mass]] of a [[Beta Particle|β-particle]]s by sending it between two [[Electrical Charge|electrically charged]] plates and observing its path.
The '''β-particle''' moves towards the [[Positive Charge|positive]] plate, so it must be [[Positive Charge|positively charged]]. The rate of curvature depends on the [[mass]]:[[Electrical Charge|charge]] [[ratio]] which indicates it has a [[Relative Atomic Mass|relative atomic mass]] of 1/2000 and [[Relative Atomic Charge|relative charge]] of -1.