Part A Which of the following panels (labelled A, B, C, and D) in (Eigure 2) correctly depicts the field lines from an infinite uniformly negatively charged sheet? Note that the sheet is being viewed edge-on in all pictures. ▸ View Available Hint(s) O B O U Submit Part B In (Eigure 2), what is wrong with panel B? (Pick only those statements that apply to panel B.) Check all that apply.

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y y :P2 B В Figure 2 Figure 1 a. i. Point P1, the intersection of the three bisectors, locates the geometric center of the triangle and is one point where the electric field is zero. On Figure 1 above, draw the electric field vectors EA, EB, and Ec at P1, due to each of the three charges. Be sure your arrows are drawn to reflect the relative magnitude of the fields.

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Two tiny spheres of mass 8.30 mg carry charges of equal magnitude, 72.0 nC, but opposite sign. They are tied to the same ceiling hook by light strings of length 0.530 m. When a horizontal uniform electric field E that Submit Previous Answers Correct is directed to the left is turned on, the spheres hang at rest with the angle 0 between the strings equal to 58.0° (Figure 1). Part B What is the magnitude E of the field? Express your answer with the appropriate units. Figure 1 of 1 HA a xa X•10" b. E = Value Units L. Submit Previous Answers Request Answer X Incorrect; Try Again; 8 attempts remaining E Provide Feedback 圓

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A charge of 140 μC is at the center of a cube of edge 45.0 cm. No other charges are nearby. (a) Find the flux through each face of the cube. Nm²/c (b) Find the flux through the whole surface of the cube. N . m²/c (c) Would your answers to parts (a) or (b) change if the charge were not at the center? (a) would change. O (b) would change. O Both (a) and (b) would change. O Neither would change.

Problem 1 Shown on the right is an electroscope. The sphere on the top, the leaves at the bot- tom, and the rod connecting them are made by conducting material. The spherical shell that blocks the influence of external electric fields is also made by conducting material but the contact with the rod is insulated, so that charges will not shuffle between the rod and the spherical shell. The electroscope is first negatively charged by touching the sphere with a negatively charged plastic plate. The leaves spread apart and we remove the plastic plate. We then bring a positively charged glass bar close to the sphere without touching the sphere. What happens to the leaves? Leaves (A) One leaf moves higher, the other lower. (B) Nothing changes to the leaves (C) The leaves spread farther apart. (D) The leaves get closer together. Clearly specify/circle your answer, and give a brief explanation.