Lab4

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Unformatted text preview: Physics 7B Charge-to-mass: e/m p. 1 NAME: GSI: ______________________________ DL SECTION NUMBER: ___________________ LAB PARTNERS: _______________________ _________________________________ MAGNETISM LAB: The Charge-to-Mass Ratio of the Electron Introduction In this lab you will explore the motion of a charged particle in a uniform magnetic field, and determine the charge-to-mass ratio (e/m) of the electron. We hope that you will also begin to develop an intuitive feel for magnetism. There are more prelab exercises for this experiment than has been normal in Physics 7B. Be sure to complete these before arriving at lab—they will count for half of your final lab score, and your GSI will initial page 2 at the start of lab to indicate that you have completed them. We suggest reading through the entire lab before attempting to complete the Prelab questions, so that they will make more sense. Prelab Questions 1. Using your Physics 7B knowledge about the force on a charged particle moving in a magnetic field, and your Physics 7A knowledge of circular (centripetal) motion, derive an equation for the radius r of the circular path that the electrons follow in terms of the magnetic field B, the electrons’ velocity v, charge e, and mass m. Y...
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