A velocity selector uses a fixed electric field of magnitude E and the magnetic field is varied to select particles of various energies. If a magnetic field of magnitude B is used to select a particle of a certain energy and mass, what magnitude of magnetic field is needed to select a particle of equal mass but twice the energy?
A. 0.50 B
B. 1.4 B
C. 2.0 B
D. 0.71 B
E. 1.7 B
Answer: D
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What will be an ideal response?