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(27-18) What is the velocity of a beam of electrons that goes undeflected when passing through perpe
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(27-18) What is the velocity of a beam of electrons that goes undeflected when passing through perpendicular electric and magnetic fields of magnitude 8.8 X 103 V/m and 7.5 X 10-3 T, respectively? What is the radius of the electron orbit if the electric field is turned off?
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