Lecture22

Lecture22 - 1 Physics 132-Winter 2008 Prof Jim Beatty-Ohio...

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Unformatted text preview: 1 February 27, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 1 Physics 132 Introductory Physics: Electricity and Magnetism Winter Quarter 2008 Lecture 22 February 27, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 2 Right Hand Rules • There are different (related) right hand rules to use for: – Getting force direction on particle or current from a B field. (Force Law) – Getting the direction of a B field from a current. (Biot-Savart) – Getting the positive direction for the surface normal in Ampere’s Law. • These are all essentially tricks to help you remember the direction of a cross product • In each case, you need to know what physical quantity corresponds to what part of your hand… 2 February 27, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 3 Ampere’s Law Gauss’ Law: E • d A = Q enc ε o closed surface ∫ Ampere’s Law: B • d s = μ i enc closed loop ∫ True for any closed loop! i enc is the sum of all currents passing through any surface enclosed by the loop. Signs given by right hand rule. February 27, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 4 Solenoids i i A coil of current wound around a cylinder is a common way to make a region containing a fairly uniform magnetic field. If the coils are close together and the solenoid is infinitely long, B inside is uniform and B outside is zero! 3 February 27, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio StateProf....
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Lecture22 - 1 Physics 132-Winter 2008 Prof Jim Beatty-Ohio...

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