lecture9

# lecture9 - Physics 2102 Physics 2102 Lecture 9 Lecture 9...

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Unformatted text preview: Physics 2102 Physics 2102 Lecture 9 Lecture 9 FIRST MIDTERM REVIEW FIRST MIDTERM REVIEW Physics 2102 Jonathan Dowling A few concepts: A few concepts: electric force, field and potential electric force, field and potential • Electric force : – What is the force on a charge produced by other charges? – What is the force on a charge when immersed in an electric field? • Electric field : – What is the electric field produced by a system of charges? (Several point charges, or a continuous distribution) • Electric potential : – What is the potential produced by a system of charges? (Several point charges, or a continuous distribution) Plus a few other items… Plus a few other items… • Electric field lines, equipotential surfaces : lines go from +ve to –ve charges; lines are perpendicular to equipotentials; lines (and equipotentials) never cross each other… • Gauss’ law : Φ =q/ ε . Given the field, what is the charge enclosed? Given the charges, what is the flux? Use it to deduce formulas for electric field. • Electric dipoles : field and potential produced BY a dipole, torque ON a dipole by an electric field, potential energy of a dipole • Electric potential, work and potential energy : work to bring a charge somewhere is W = –qV (signs!). Potential energy of a system = negative work done to build it. • Conductors : field and potential inside conductors, and on the surface. • Shell theorem : systems with spherical symmetry can be thought of as a single point charge (but how much charge?) • Symmetry, and “infinite” systems . Conductors and insulators Conductors and insulators • Will two charged objects attract or repel? • Can a charged object attract or repel an uncharged object? • What is the electric field inside a conductor? • What is the direction of the electric field on the surface of a conductor? • What happens to a conductor when it is immersed in an electric field? Electric forces and fields: point charges Electric forces and fields: point charges Figure 22N-14 shows an arrangement of four charged particles, with angle θ = 34 ° and distance d = 2.20 cm. The two negatively charged particles on the cm....
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## This note was uploaded on 01/14/2010 for the course IIYTD 2A taught by Professor T during the Spring '09 term at St. Catherine.

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lecture9 - Physics 2102 Physics 2102 Lecture 9 Lecture 9...

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