UESTIONS 1. What is the basis for the statement that lines of electric force mov
ID: 1414788 • Letter: U
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UESTIONS 1. What is the basis for the statement that lines of electric force moved just outside the original sphere: (e) if a second charge is placed near, and outside, the original sphere: and (f) if a second charge is placed inside the Gaussian srface? In Gauss' law 63 E-A = q, is E necessarily the electric field attributable to the charge q? A surface encloses an electric dipole. What can you say about d'E for this surface? begin and end only on electric charges? 2. Positive charges are sometimes called "sources" and negative charges "sinks" of electric field. How would you justify this terminology? Are there sources and/or sinks of gravitational 3/ By analogy with 4, how would you define the flux 4, of a gravitational field? What is the flux of the Earth's gravita- 10., Suppose that a Gaussian surface encloses no net charge. Does tional field through the boundaries of a room, assumed to contain no matter? Through a spherical surface closely sur- rounding the Earth? Through a spherical surface the size of the Moon's orbit? Consider the Gaussian surface that surrounds part of the 1 Is Gauss' law useful in calculating the field due to three equal charge distribution shown in Fig. 27-21. (a) Which of the charges contribute to the electric field at point P? (b) Would the value obtained for the flux through the surface, calculated 12, A total charge is distributed uniformly throughouta using only the field due to qi and q2, be greater than, equal to, or less than that obtained using the total field? Gauss' law require that E equal zero for all points on the sur- face? Is the converse of this statement true; that is, if E equals zero everywhere on the surface, does Gauss' law require that there be no net charge inside? charges located at the corners of an equilateral triangle? Ex- plain why or why not. cube of edge length a. Is the resulting electric field at an external point P, a distance r from the center C of the cube, given by E = QI4TEor? See Fig. 27-22. If not, can E be found by constructing a "concentric" cubical Gaussian surface? If not, explain why not. Can you say anything about E if r >> a? FIGURE 27-21. Question 4. FIGURE 27-22. Question 12 5 Suppose that an electric field in some region is found to have a constant direction but to be decreasing in strength in that di rection. What do you conclude about the charge in the region? 13, Is E necessarily zero inside a charged rubber balloon if the balloon is (a) spherical or (b) sausage-shaped? For each shape, assume the charge to be distributed uniformly over the surface. How would the situation change, if at all, if the bal loon has a thin layer of conducting paint on its outside sur- Sketch the lines of force Is it precisely true that Gauss' law states that the total number of lines of force crossing any closed surface in the outward direction is proportional to the net positive charge enclosed within the surface? .JA point charge is placed at the center of a spherical Gaussian 14. A spherical rubber balloon cames a charge that is uniformly Is , changed (a) if the surface is replaced by a cube of the same volume: (b) if the sphere is replaced by a cube of one-tenth the volume: (c) if the charge is moved off-center in the original sphere, still remaining inside: (d) if the charge is distributed over its surface. As the balloon is blown up, how does E vary for points (a) inside the balloon, (b) at the surface of the balloon, and (c) outside the balloon?Explanation / Answer
1: Lines of electric force is nothing but indication of electric force strength.Now, electric force is generated by electric charges.
2: Electric field lines starts from positive charge,so it is source.
It ends at negative charge,so, named sink.
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