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**Unformatted text preview: **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: O x q 3 stable equilibrium ? Translate: prove that the electric potential energy of the whole system when bead 3 at position x is the minimum. O x q 3 Formula to use: Gauss’s Law a type X problem? A sphere of radius 2 a 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. c r r r r Some easier problems Finding the C eq Some easier problems Finding the C eq Kirchhoff’s rules Determine the current in each branch....

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