HW1-Introduction

HW1-Introduction - Physics 209 Problem Set #1 Due date: Sep...

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Physics 209 Problem Set #1 Due date: Sep 4, 2009 1 Orders of magnitude estimates 1. Verify (or disprove) the estimates given in class for the order of magnitude of the electric Feld in the following settings: The electric Feld produced by the proton at the position of the orbiting electron in a Hydrogen atom. The electric Feld at the surface of heavy nuclei. 2. Estimate the order of magnitude of the total net current that circulates at the liquid iron core of the Earth, given the order of magnitude estimate B 5 × 10 - 5 T at the surface, and given that the liquid core extends between about 1000km to 3000km from the center (i.e., is at about r 10 6 m in order of magnitude). 2 Tests of Coulomb’s Law Cavendish’s experiment tests the 1 /r fall-off of the electrostatic potential of a point charge. To understand the experiment, let’s assume that the “electrostatic” potential of a point charge q is Φ( r )= q/ 4 π±r 1+ η . (Note that ± has an extra dimenion of Length
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HW1-Introduction - Physics 209 Problem Set #1 Due date: Sep...

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