Moving Charge in a Magnetic Field question from MHT CET 2024 (2 May, Shift 2)

Answer: (b)

1. Neutrons are uncharged, so a cyclotron cannot accelerate them.
2. Electrons are too light: their mass grows relativistically at low energy and they fall out of step with the oscillator.
3. It is used for heavy positive ions such as protons, deuterons and $\alpha$-particles.
4. So the answer is (b) positively charged particles only.