If the plane x = 4 m is an equipotential surface, in which of the following directions can the electric field be in the region immediately adjacent to this plane?

The metal conductor (shaped like a “C”) is positively charged.  (Assume this is a cross-section of a conductor.)  a) Sketch the electric field lines (solid arrows) and equipotential lines (dotted) around this conductor. Do at least 3 equipotential lines.  Be sure to fill in the electric field lines all around the conductor; pay special attention to the area between the arms of the  “C”.  Be sure to extend the electric field arrows that start there long enough so that they go out beyond the arms. b) If you were drawing equipotential lines very very far from the “C”, what shape would they look like? c) Describe the electric field INSIDE the conductor (the shaded part (colored blue if you can see the color)). d) We don’t have an equation to calculate the potential around this shape of conductor, but we can qualitatively compare values. Which of your 3 equipotential lines would be at the higher potential?  (Which is the higher voltage?)  The one closest to the conductor, in the middle, or…

Show that the force on each plate of a parallel plate capacitor has a magnitude equal to (½) QE, where Q is the charge on the capacitor, and E is the magnitude of electric field between the plates. Explain the origin of the factor ½.

A charged ring with charge Q = 644 nC and radius R=0.67 m is placed in a tank of water. What is the electric field at the point z = 0.085 m above the midpoint of the ring, if the dielectric constant of water is 80.4? Answer in N/C and round your answer to have one digit after the decimal. Water 20 °C K = 80.4 Your Answer: Answer