 # Physics Questions

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Question 1 1 pts When two point charges are 2.0 cm apart, each one experiences a 1.0-N electric force due to the other charge. If they are moved to a new separation of 8.0 cm, the electric force on each of them is closest to 1.0 N 4.0 N 0.25 N - 0.063 N 16.0 N Question 2 1 pts A +3.00 C point charge and a 5.00 uc point charge are placed along the x-axis at x = 0.00 cm and x 40.0 cm, respectively. Where must a third charge, a, be placed along the x-axis so that it does not experience any net electric force due to the other two charges? 1.37 m -0.200 m -0.175 m - -1.37 m 0.175 m The point charge at the bottom of the figure is Q = +20 nc, and the curve is a circul arc. What is the magnitude of the force on the charge Q due to the other point charges shown? -6.0 nC 2.0 nC - 2.0nC + + 5.0 cm 45° - 45° 5.0 cm + Q 1.8 X 10-4 N Sm 1.4 X 10-4 N 4.6 X 10-4 N 2.7 X 10-4 N 2.3 X 10-4 N Question 4 1 pts +0.400 In the figure, a small spherical insulator of mass 6.00 x 10 2 kg and 0.290 m C is hung by a thin wire of negligible mass. A charge of -0.220 charge pc is angle 0 with away the from vertical, the sphere as shown. and directly What is to the the angle right 0? of it, so the wire makes held an 0.290 m +0.400 C -0.220 C 1.50 deg. 0.917 deg. 1.30 deg. 1.10 deg. 1.70 deg. Question 5 1 pts A 3.0 C positive point charge is located at the origin and a 8.0 C positive point charge is located at X 0.00 m, y = 1.0 m. Find the coordinates of the point where the net electric field strength due to these charges is zero. X = 0.00 m, y = 0.61 m X = 0.00 m, y = 0.27 m X 0.00 m, y = 0.49 m X = 0.00 m, y = 0.38 m X = 0.00 m, y = -0.38 m A point charge Q = -500 nC and two unknown point charges, 91 and 92, are placed as shown in the figure. The electric field at the origin o, due to charges Q, 91 and 92, is equal to zero. The value of the charge 91 is closest to y A Q 20m 30° 1.1 m 91 - 1.3 m 42 150 nC 130 l nC -130 - nC -76 nC 76 nC Question 7 1 pts An electric field is set up between two parallel plates, each of area 2.0 m2, by putting 1.0 C of charge on one plate and - -1.0 C of charge on the other. The plates are separated by 4.0 mm with their centers opposite each other, and the charges are distributed uniformly over the surface of the plates. What is the magnitude of the electric field between the plates at a distance of 1.0 mm from the positive plate, but not near the edges of the plates? 1.4x104 N/C 0.00 N/C 5.6x104 N/C 3.1x104 N/C 4.2x104 N/C Question 8 1 pts Two flat 4.0 cm X 4.0 cm electrodes carrying equal but opposite charges are spaced 2.0 mm apart with their midpoints opposite each other. Between the electrodes but not near their edges, the electric field strength is 7.2 106 N/C. What is the magnitude of the charge on each electrode? the 85 no 46 nc 51 no 100 nC 72 nC Question 9 1 pts A charge Q is uniformly spread over one surface of a very large nonconducting sheet, the magnitude of the electric field due to the sheet is E. If the sheet is square elastic sheet having sides of length d. At a point P that is 1.25 cm outside the at P? stretched so that its sides have length 2d, what is the magnitude of the electric now field w E 2E E/2 E/4 4E Question 10 1 pts A non-conducting sphere of radius R = 7.0 cm carries a charge Q=4.0 mC distributed uniformly throughout its volume. At what distance(s), measured from the center of the sphere, does the electric field reach a value equal to half its maximum value? the 3.5 cm only 3.5 cm and 4.9 cm 9.9 cm only 3.5 cm and 9.9 cm 4.9 cm only Question 11 1 pts The circles in each of the figure represent charges of the same size, 20 C, which can be either positive or negative, according to the figure. At the numbered points there is a +5C charge. The distances between adjacent items are all 5 cm. Rank these arrangements from greatest to least on the basis of the strength of the force on the +5C charge. + + - C 3 IF1| = IF2| = IF3| = IF4| = IF5| = IF5| > (F2) > IF1| IF4| = IF5| > (F2) > IF3| > IF2| > IF4| = IF4| > (F2) = I F3 I > IF1| = IF5| Question 12 1 pts The arrows in the figure represent the electric field between two charged parallet metal plates. The following statement is correct: 1 2 3 The upper plate is positive and the lower plate is negative. - A positive charge placed at point 1 would experience the same force if it were placed at point 3. - A positive charge placed at point 1 would experience more force than if it were placed at point 2. A positive charge placed at points1, 2, or 3 would experience no force. A positive charge placed at points 2 and 3 would experience the same force, and this force would be greater than the force the same charge would experience at point 1.

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