Electric Force and Electric Field

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$a) What force does Trask exert on Butch? F - ^\ ~\â¢ *$

'L.J,'.advantage-"50+2Q-O"DAEFigure 8B5. Charges +2Q and — 5Q are situated as shown. At what point could the electric field beequal to 0?(A) A (B) B (C) C (D) £> (E) E6. Starting from rest a charge moves a distance d along uniform field lines after which it hasa speed v. If an identical charge moves from rest through a distance 2d along the samefield lines it will have a speed of(A) jp (B)jv (C) 4lv (D) 2v (E) Av7. Charge q with mass m is a distance R from a second charge 2q with mass 2m. If F and aare the force and acceleration of the first charge, the force and acceleration of the secondcharge are(A) F and 2a (B) 2F and a (C) 2F and y a (D) 2F and 2a (E) F and y aPRACTICE EXERCISESSection II Free Response1. Two charges are located along the x-axis, —3 //C at the origin and +6 fiC, at thepoint (2, 0).(a) Determine the electric field at the point (—1, 0).(b) Find the magnitude and direction of the force on an electron placed at (— 1, 0).(c) Determine the point on the x-axis where the electric field is 0.Chapter 10
Physics B ReviewFigure 92. A nonconducting sphere of charge +Qand mass m is attached to a string of length L andhangs from a ceiling. When a uniform electric field directed horizontally is introduced,equilibrium is eventually established with the mass hanging at an angle 6 with respect tothe vertical. In terms of g and the given quantities, find the strength of the electric fieldand the tension in the string.3. A positive charge q is initially at the origin and moving with velocity v0 > 0 oppositeto a uniform electric field E directed in the negative x direction. The effects of gravityare negligible.(a) Determine the maximum coordinate x the charge attains.(b) Determine the time it takes for the charge to return to its starting point.(c) Determine the speed of the charge when it has the coordinate —x.Answers andExplanationsMultiple Choice1. The answer is C. At the center, the field created by the top left charge is directed alongthe diagonal away from that charge, while the field created by the bottom left charge isdirected toward it along the other diagonal. Since the two fields have the same strength,the horizontal components cancel out.2. The answer is C. This point is closest to both charges, and the two separate fields createdby each charge are in the same direction—down—so there is no cancellation.3. The answer is A. The field at 5 is 3 =9 times bigger since R is 3 times further away.Electric Force and Electric Field
Page 1 and 2: CHAPTEElectric Force and Electric F
Page 3 and 4: Physics B ReviewBecause both charge
Page 5 and 6: Physics B Review-4//C2//CFigure 5A
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