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Transcript
The sphere on the right has a charge of +2q. The sphere to the left has a charge of – 3q. Which of the followingdescription pictorial descriptions Construct a pictorial of the of the electric field that bestbest matches the above electric field lines matches the verbal abovedescription? verbal description. 2 1 3 4 Jenny, a student in an introductory physics class sees the following equation: (1.6 x 10-5 C) (5.0 x 106 N/C) – 10 N = (.015 kg) a Which the following verbal descriptions best Write aofverbal description that best matches the matches the above mathematical representation? above mathematical representation. 1 A proton is in electric field that experiences a 10 N force holding it back. 2 A mass of 0.015 kg is experiencing just one force due to an electric field of 5.0 x 106 N/C. 3 A charged particle is being accelerated through an electric field but also experiences some force in the opposite direction. 4 A particle has a charge of 1.6 x 10-5 C is being accelerated only by the result of a 10 N force applied to it. Two equal magnitude charged spheres are held near each other. The electric field measured at point A points at a 45o angle North of West. Which of the following pictures Construct a picture which couldbelow match the matches the above description? above description. 1 3 A A 2 A x x +q x +√2 q x +q x +q +q +q x A proton starts at rest between metal sheets with a potential difference of 100 Volts across them. Vinit = 100 V Vfinal = 0 V Which of the following motionthat diagrams could Construct a motion diagram matches the match themotion motionwhen of thereleased. proton? proton’s 1 2 3 4 Sara is looking over her physics textbook and sees a situation described mathematically below. (3 x 1012 ) (1.6 x 1019 ) I (3060) Ne I t The same the situation described in words Describe same is situation in words below. below. Decide which description fits the mathematical description best. 1 3 x 1012 protons travel through a wire each hour. 2 3 x 1012 electrons travel through a wire in each hour. 3 3 x 1012 electrons travel through a wire in just under an hour. 4 3 x 1012 Coulombs of charge travel through a wire in just under an hour. A picture is drawn below showing equipotential surfaces for two fixed charged pith balls. Which the following verbal descriptions Write aofverbal description that matches thebest above match the above equipotential surfaces? equipotential surfaces. 1. Both pith balls are positively charged. 2. Both pith balls are negatively charged. 3. One pith ball is positively charged, the other is negatively charged. 4. Both 1 and 2 are possible solutions A situation is described with an energy bar chart below. Ko PEgo PEso PEqo W K PEg PEs PEq Eint 0 Which the following verbal representations best Write aofverbal representation to best match the matches thechart. above bar chart? above bar 1 A charged object shoots straight up away from another charged object and reaches its highest point. 2 A charged object is high above the ground in an electric field. The field pulls the charged particle downward. We see the system’s energy when it is halfway down to the ground.. 3 A charged object initially at rest moves at an angle away from a second like charged object. At the top of the projectile path the object is moving horizontally. 4 A proton is held below a negatively charged sphere and released. Three identical magnitude charged spheres are shown below. +q1 -q3 +q2 Which electrical force diagram corresponds to the pictorial Construct an electrical force diagram to correspond to the representation? pictorial representation for q3. 1 2 Fq2 on q3 y x Fq1 on q3 Fq2 on q3 y x Fq1 on q3 3 4 Fq2 on q3 y x Fq1 on q3 Fq2 on q3 y x Fq1 on q3 A student sees in a textbook the picture below of two charged spheres and the corresponding electric field lines. Which of the following verbal descriptions best Construct a verbal description that best matches the matches the above pictorial representation? above pictorial representation. 1 The two spheres have charges that are opposite but equal in magnitude. 2 The left sphere has a positive charge that is twice the magnitude of the negative charge on the right. 3 The left sphere has a negative charge that is twice the magnitude of the positive charge on the right. 4 The right sphere must not have all of the lines drawn into it. A positively charged sphere is held in a fixed position relative to a negatively charged sphere on the left with half the magnitude of electric charge. Which pair of electric force diagrams below that bestbest Construct a pair of electric force diagrams matches matchesthe theabove aboveverbal verbaldescription? description. y 1 y Fneg on pos 2 Fneg on pos Fpos on neg x y y 3 y Fneg on pos y Fpos on neg x y Fpos on neg x 4 Fneg on pos y Fpos on neg x Four charged spheres, not necessarily the same magnitude charge, are placed at the corners of a square. The net electrical force on sphere C is zero. A C B D What Whatare arethe thesigns signsof ofthe thecharged chargedspheres spheresto tomatch match the theabove aboveverbal verbaldescription? description? A B C D 1 + – – + 2 – – – + 3 – – + + 4 + + + + 5 + – + – A process is shown in the picture below. The charged sphere on the right is fixed. The left charged sphere is on a moveable cart. It is initially held by a wedge, then let go. Initial + + v Final + + What energy chartbar best matches the pictorial Construct anbar energy chart that best matches representation? the pictorial Ko PEgo PEso PEqo W K PEg PEs PEq Eint representation. 1 2 3 A real situation is described mathematically: ½ m vo2 + q Vo = ½ m v2 + q V ½ (.001 kg) (0 m/s)2 + (1.0 x 10-6 C) (12 V) = ½ (.001 kg) v2 + (1.0 x 10-6 C) (0 V) The same situation described that verbally below. Which Construct a verbal is description fits the above description fitsdescription the above mathematical description best? mathematical best. 1 A .001 kg object is moving across the plates of a capacitor at a constant speed. 2 An object whose charge is 1.0 x 10-6 C is initially moving at some speed, v away from a 12 Volt plate until it comes to rest. 3 A .001 kilogram object that has a charge is initially at rest in a capacitor but then moves across the 12 Volt potential difference. 4 The plate where the object comes to has no charge on it.