Two singly ionized isotopes of lead are accelerated through the same potential difference and en...

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Two singly ionized isotopes of lead are accelerated through the same potential difference and enter perpendicular to a uniform magnetic field. Then
(A) Their kinetic energies before entering the magnetic field are equal and remain equal in the magnetic field.
(B) They trace circular orbits of the same radii in the magnetic field.
(C) The radius of the circular orbit of the heavier isotope in the magnetic field is greater than that of the lighter isotope
(D) The radii of the circular orbits in the magnetic field are in the direct ratio of the magnitude of their momenta
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