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37. The charge on the metal plate, which is negative, exerts a force of repulsion on the electron and stops it. First find an expression for the acceleration of the electron, then use kinematics to find the stopping distance. We take the initial direction of motion of the electron to be positive. Then, the electric field is given by E = σ / ε 0 , where is the surface charge density on the plate. The force on the electron is F = –eE = –e / ε 0 and the acceleration is 0 Fe a mm ε == − where m is the mass of the electron. The force is constant, so we use constant acceleration
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This note was uploaded on 01/25/2011 for the course PHYSICS 17029 taught by Professor Rebello,nobels during the Spring '10 term at Kansas State University.
- Spring '10