A velocity selector consists of electric and magnetic fields described by the expressions E = E k and B = B ĵ, with B = 10.0 mT. Find the value of E (in kV/m) such that a 840 eV electron moving in the negative x-direction is undeflected. kV/m (b) What If? For the value of E found in part (a), what would the kinetic energy of a proton have to be (in MeV) for it to move undeflected in the negative x-direction? MeV

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter11: Magnetic Forces And Fields

Section: Chapter Questions

Problem 55P: The magnetic field in a cyclotron is 1.25 T, and the maximum orbital radius of the circulating...

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Question

A velocity selector consists of electric and magnetic fields described by the expressions E = E k and B = B ĵ, with B = 10.0 mT. Find the value of E (in kV/m) such that a 840 eV electron moving in the negative x-direction is undeflected. kV/m (b) What If? For the value of E found in part (a), what would the kinetic energy of a proton have to be (in MeV) for it to move undeflected in the negative x-direction? MeV A cyclotron designed to accelerate protons has a magnetic field of magnitude 0.640 T over a region of radius 1.80 m. (a) What is the cyclotron frequency? rad/s (b) What is the maximum speed acquired by the protons? m/s

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