A different reviewElectric field of a dipoleElectric field of a charged rodForce/field equilibriumstable equilibrium?Gauss’s Law a type X problem?Slide 8Some easier problems Finding the CeqSlide 10Kirchhoff’s rulesA different reviewA review of the following topics by working on problems1. Electric charge, potential, force, field and flux. Coulomb's Law Gauss’s Law.2. Capacitance and resistance. Ohm’s Law.3. Circuits. Kirchhoff’s Rules.Electric field of a dipoleCalculate the electric field of a point on the x and y axis, far away from an electric dipole. xxPFormula to use:For a point on x:Calculate the electric field of a point on the x and y axis, far away from an electric dipole. xxPFor a point on y, the field y components cancel.Electric field of a charged rodCalculate the electric field at the origin O of the coordinator system, generated by an evenly charged rod with total charge +Q, with length l , and placed distance a away from O on the x-axis. OFormula to use:Force/field equilibriumTwo small positively charged beads are fixed at the ends of a horizontal insulating rod. A third small charged bead is free to slide on the rod. At what position is the third bead in equilibrium? Is this a stable equilibrium?Formula to use:Oxq3stable equilibrium?Translate: prove that the electric potential energy of the whole system when bead 3 at position x is the minimum. Oxq3Formula to use:Gauss’s Lawa type X problem?A sphere of radius 2a is made of insulating material that has uniform volume charge density ρ. Assume that the material itself does not affect the electric field (i.e., ignore its dielectric effect). A spherical cavity of radius a is made in the original sphere as shown in the figure. Calculate the electric field in the cavity.crrrrSome easier problemsFinding the CeqSome easier problemsFinding the CeqKirchhoff’s rulesDetermine the current in each
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