he figure below shows a schematic diagram of a mass spectrometer. A charged particle enters a velocity selector, in which a uniform electric field E (created by charged plates) points to the right, and a magnetic field Bin points into the page. Upon exiting the velocity selector, the particle enters a deflection chamber with a magnetic field B0, in. The particle travels a semicircular path until it hits a photographic plate at point P. Assume the particle is a singly charged ion with mass m = 2.14 ✕ 10−26 kg. The magnitude of the electric field is 945 V/m, and the magnitude of both the magnetic field in the velocity

Principles of Physics: A Calculus-Based Text
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ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
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Chapter22: Magnetic Forces And Magnetic Fields
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The figure below shows a schematic diagram of a mass spectrometer. A charged particle enters a velocity selector, in which a uniform electric field 
E
 (created by charged plates) points to the right, and a magnetic field 
Bin
 points into the page. Upon exiting the velocity selector, the particle enters a deflection chamber with a magnetic field 
B0, in.
 The particle travels a semicircular path until it hits a photographic plate at point P.
Assume the particle is a singly charged ion with mass 
m = 2.14 ✕ 10−26 kg.
 The magnitude of the electric field is 945 V/m, and the magnitude of both the magnetic field in the velocity selector and in the deflection chamber is 0.935 T. What is the radius r (in m) of the particle's path in the deflection chamber?
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