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Which of the following is deflected by an electric field?

1. X-rays
2. $\gamma$-rays
3. Neutrons
4. $\alpha$-particles

Correct answer: $\alpha$-particles

Solution

Electric fields deflect charged particles because they experience a force $F=qE$. X-rays, gamma rays, and neutrons are electrically neutral, while $\alpha$-particles carry positive charge. Therefore, only $\alpha$-particles are deflected.

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