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A proton, an electron, and a Helium nucleus, have the same energy. They are in circular orbitals in a plane due to magnetic field perpendicular to the plane. Let rₚ, rₑ and ʳHe be their respective radii, then,(A) rₑ > rₚ = ʳHe (B) rₑ > rₚ > ʳHe (C) rₑ < rₚ < ʳHe (D) rₑ < rₚ = ʳHe |
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