3. In A. J. Dempster's mass spectrometer as shown in right figure, two isotopes with masses m₁ and m₂ are accelerated from rest by a potential difference V₀. They then enter a uniform field B normal to the magnetic field lines. (Assume both isotopes have the same charge q)

(A) Both kinetic energies of the accelerated particles are qV₀
(B) The speed of isotope with m₁ is v₁ = (qV₀/m₁)^1/2
(C) The radius of the path in the magnetic field for the isotope with m₂ is r₂ = (m₂V₀/qB²)^1/2
(D) r₁/r₂ = (m₁/m₂)^1/2
(E) r₁/r₂ = (m₂/m₁)^1/2