(a) A velocity selector consists of electric and magnetic fields described by the expressions E = EK and B = B j, with B = 13.0 mT. Find the value of E (in kV/m) such that a 720 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
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Chapter11: Magnetic Forces And Fields
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Problem 55P: The magnetic field in a cyclotron is 1.25 T, and the maximum orbital radius of the circulating...
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(a) A velocity selector consists of electric and magnetic fields described by the expressions E = Ek and B = Bj, with B = 13.0 mT. Find the
value of E (in kV/m) such that a 720 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
Transcribed Image Text:(a) A velocity selector consists of electric and magnetic fields described by the expressions E = Ek and B = Bj, with B = 13.0 mT. Find the value of E (in kV/m) such that a 720 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
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