(a) A velocity selector consists of electric and magnetic fields described bythe expressions É = ER and B = 8j, Wwith B = 21.0 mT. Find the value of E (inkV/m) such that a 720 ev electron moving in the negative x-direction isundeflected.kV/m(b) What If? For the value of E found in part (a), what would the kineticenergy of a proton have to be (in MeV) for it to move undeflected in thenegative x-direction?MeV

A charged particle with charge q in an electric field E→ experiences the force F→=qE→. The…

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can you please ans (a) (b) (c)?
The Hall affect is used to measure the carrier density of a thin sheet of electrons. When a current of 80.0 µA flows through the length of the electron sheet, which is 1.2-mm long, 0.27- mm wide and 12-nm thick, a magnetic field perpendicular to the sheet produces a potential difference of 0.53 mV across the width of the sheet. If the carrier density in the electron sheet is 6.74 x 1025 m-3, what is the magnitude of the magnetic field?
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(a) A velocity selector consists of electric and magnetic fields described by the expressions E = EK and B = B ĵ, with B = 25.0 mT. Find the value of E (in kV/m) such that a 830 eV electron moving in the negative x-direction is undeflected. 427 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
Problem 2 Show that in a current-free volume of space, a static magnetic field can never have a local maximum by considering V(B· B) · da, where S is the surface of a small volume V containing a point P in space.
An electron is accelerated from rest through a potential difference V after which it enters a region having a magnetic field of magnitude B and direction perpendicular to the electron's velocity. The radius of the electron orbit in this magnetic field is given by: meV 2BN e 2m, V Be 2m. VB O 1 2m.V B e O 1 meV BV 2e O there is not enough information to determine 2m.V BV O none of these
(a) A velocity selector consists of electric and magnetic fields described by the expressions E = Ek and B = B ĵ, with B = 25.0 mT. Find the value of E (in kV/m) such that a 770 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) A velocity selector consists of electric and magnetic fields described by the expressions E = EK and B = Bĵ, with B = 23.0 mT. Find the value of E (in kv/m) such that a 780 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) A velocity selector consists of electric and magnetic fields described by the expressions E = E K ar undeflected. kv/m and B = Bĵ, with B = 19.0 mT. Find the value of E (in kV/m) such that a 820 eV electron moving in the negative x-direction is (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) A velocity selector consists of electric and magnetic fields described by the expressions E = EK and B = B ĵ, with B = 18.0 mT. Find the value of E (in kV/m) such that a 840 eV electron moving in the negative x-direction is undeflected. 309 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