Question

or multiple choice questions, please show all work for part marks. Correct answers will get full marks, incorrect choices will get part marks for any g crossing off incorrect answers, providled the correct answer is not crossed off. Please choose only one correct answer pes qveition 1. An electrie dipole moving at constant velocity in s consiant electric fie (a) Must move parallel to the electric field. (b) Will rotate until its dipole moment is parallel to the electric f c) Must be acted on by another force in addition to the electric force, as an electric dipole in only a constant electric field will not move at constant velocity. (d) Will rotate until its dipole moment is opposite to the electric field. (e) Must move perpendicular to the electric field. y (mE 3q x(m) Fla. 1: 2. Where along the x-axis is the electric field zero if two point charges are placed as in Fig. 1? The charge at 0 is q and the charge at z 3m is -3. /5 (a) x1.0 m (b) x 1.1 m (c) x 5.8 m (d) x 4.1 m (e) x =-2.3 m A2 Blue Gold As Blue FIG. 2: 3. A long coaxial cable has charge per unit length 1 8.0 C/m on its inner cable (of radius i cm), and λ2 -5.0μC/m on its outer cable (radius 2cm). A Gaussian surface (radius 3 cm) of length L 0.50m is chosen coaxial with the cables as shown in Fig. 2, with the same number of alternating blue and gold stripes along its length of equal width, each covering 1/2 of the cylinder's outer surface. The flux through the gold stripes is: (a) 8.5 x 104Y (b) 1.7 x 105 O (c)-1.7 x 104 (d) 4.5 x 1011 Nm /5 (e) 1.7× 101嚀 FIG. 3 4. Silver, a good conductor, spills onto a paper in the shape shown. If a charge Q is placed on the silver paint, when it reaches electrostatic equilibrium, the charge (a) Point 1, since the net electric field parallel to the surface from other charges (b) Point 2, since the components of the electric fields parallel to the boundary (c) Point 3, since the components of the electric fields perpendicular to the bound- density will be highest at: /5 is non-zero here. from other charges is largest here. ary from other charges is largest here. (d) Point 1, since the forces from neighbouring charges in this region have large components pointing outside the conductor. (e) All points 1, 2, and 3 have equal charge densities.

Answer 1

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