PHY 712 Electrodynamics 9-9:50 AM MWF Olin 103 Plan for Lecture 6:

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PHY 712 Electrodynamics 9-9:50 AM MWF Olin 103 Plan for Lecture 6: Continue reading Chapter 2 Methods of images -- planes, spheres Solution of Poisson equation in for other geometries -- cylindrical 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

1/25/2017 PHY 712 Spring 2017 -- Lecture 6

1/25/2017 PHY 712 Spring 2017 -- Lecture 6

Direct integration of differential equation Survey of mathematical techniques for analyzing electrostatics – the Poisson equation Direct integration of differential equation Green’s function techniques Orthogonal function expansions Numerical methods (finite differences and finite element methods) Method of images 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

Clever trick for specialized geometries: Flat plane (surface) Sphere Method of images Clever trick for specialized geometries: Flat plane (surface) Sphere Planar case: Consider a grounded metal sheet, a distance d from a point charge q. q d 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

A grounded metal sheet, a distance d from a point charge q. Mobile charges from the “ground” respond to the force from the charge q. z q d x y 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

A grounded metal sheet, a distance d from a point charge q. 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

A grounded metal sheet, a distance d from a point charge q. 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

A grounded metal sheet, a distance d from a point charge q. 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

A grounded metal sphere of radius a, in the presence of a point charge q at a distance d from its center. r d q a 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

A grounded metal sphere of radius a, in the presence of a point charge q at a distance d from its center. r d q a 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

A grounded metal sphere of radius a, in the presence of a point charge q at a distance d from its center. r d q a 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

Use of image charge formalism to construct Green’s function 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

Solution of the Poisson/Laplace equation in various geometries -- cylindrical geometry with no z-dependence (infinitely long wire, for example): r f 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

Solution of the Poisson/Laplace equation in various geometries -- cylindrical geometry with no z-dependence (infinitely long wire, for example): r f 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

Solution of the Poisson/Laplace equation in various geometries -- cylindrical geometry with z-dependence f r z 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

Cylindrical geometry continued: 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

Cylindrical geometry example: 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

Cylindrical geometry example: 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

Comments on cylindrical Bessel functions K0 I0/50 J0 N0 1/25/2017 PHY 712 Spring 2017 -- Lecture 6

Comments on cylindrical Bessel functions J1 N1 I1/50 m=1 K1 1/25/2017 PHY 712 Spring 2017 -- Lecture 6