10ElectrostaticsandElectricFields (3)

10ElectrostaticsandElectricFields (3) - Electrostatics and...

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Electrostatics and Electric Fields 39. The electric field E just outside the surface of a charged conductor is (A) directed perpendicular to the surface (B) directed parallel to the surface (C) independent of the surface charge density (D) zero (E) infinite 40. A closed surface, in the shape of a cube of side a, is oriented as shown above in a region where there is a constant electric field of magnitude E parallel to the x-axis. The total electric flux through the cubical surface is (A) -Ea 2 (B) zero (C) Ea 2 (D) 2Ea 2 (E) 6Ea 2 42. The figure above shows a spherical distribution of charge of radius R and constant charge density ρ . Which of the following graphs best represents the electric field strength E as a function of the distance r from the center of the sphere?

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Questions 52 - 53 Two positive charges of magnitude q are each a distance d from the origin A of a coordinate systen. as shown above. 52. At which of the following points is the electric field least in magnitude? (A) A (B) B (C) C (D) D (E) E 53. At which of the following points is the electric potential greatest in magnitude? (A) A (B) B (C) C (D) D (E) E 64. The electric field of two long coaxial cylinders is represented by lines of force as shown above. The charge on the inner cylinder is +Q. The charge on the outer cylinder is (A) +3Q (B) +Q (C) 0 (D) - Q (E) -3 Q Questions 47-48 relate to the following configurations of electric charges located at the vertices of an equilateral triangle. Point P is equidistant from the charges. 47. In which configuration is the electric field at P equal to zero? (A) (B) (C) (D) (E) 48. In which configuration is the electric field at P pointed at the midpoint between two of the charges? (A) (B) (C) (D) (E) Questions 66 - 67
Positive charge Q is uniformly distributed over a thin ring of radius a that lies in a plane perpendicular to the x-axis. with its center at the origin 0, as shown above. 66. The potential V at points on the x-axis is represented by which of the following functions? (A) V x kQ x a ( ) = + 2 2 (B) V x kQ a x ( ) = + 2 2 (C) V x kQ x ( ) = 2 (D) V x kQ x ( ) = ( E) V x kQ a x ( ) = + 67. Which of the following graphs best represents the electric field along the positive x-axis? 36. From the electric field vector at a point, one can determine which of the following? I. The direction of the electrostatic force on a test charge of known sign at that point II. The magnitude of the electrostatic force exerted per unit charge on a test charge at that point III. The electrostatic charge at that point A) I only B) III only C) I and II only D) II and III only E) I, II, and III 37. A circular ring made of an insulating material is cut in half. One half is given a charge -q uniformly distributed along its arc. The other half is given a charge + q also uniformly distributed along its arc. The two halves are then rejoined with insulation at the junctions J, as shown above. If there is no change in the charge distributions, what is the direction of the net electrostatic force on an electron located at the center of the circle? A)

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10ElectrostaticsandElectricFields (3) - Electrostatics and...

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