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A velocity filter with crossed electric and magnetic fields allows the passage of simply ionized \ ...
A velocity filter with crossed electric and magnetic fields allows the passage of simply ionized \( { }^{22} \mathrm{Ne} \) atoms having an energy of \( 2 \times 10^{4} \mathrm{eV} \). If the electric field is \( 3 \times 10^{4} \mathrm{~V} / \mathrm{m} \), what is the required magnetic field?