A cathode ray beam (i.e., an electron beam; me = 9.1 10 31 kg, q =
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A cathode ray beam (i.e., an electron beam; me = 9.1 × 10−31 kg, q = −e) is bent in a circle of radius 2.0 cm by a uniform field with B = 4.5 × 10−3 T. What is the speed of the electrons?
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