Discussion
An electric field can deflect :
Answer: D
An electric field can deflect α-particles.
An electric field exerts a force only on charged particles. Alpha particles are helium nuclei carrying a charge of +2e, so they are deflected towards the negative plate.
X-rays and gamma rays are electromagnetic radiation with no charge, and neutrons are uncharged particles, so all three pass through an electric field undeflected.
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