3 N/C. Ans. I.,3a)cIo 1. Spring 2009 (Ford) Physics 202 MWF 10:20 Name (printed) Lab Sect ion. Final Exam
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1 Physics 202 MWF 10:20 Name (printed) Name (signature as on ID) Final Exam Spring 2009 (Ford) Lab Sect ion Show all your work. Partial cre(lit will he given if earned. Write your answers in the blanks provided. (10 pts) 1. Negative point charge q = 8.0 x 10 C is at the origin and positive point charge Q2 = +6.0 x 10 C is on the mr-axis at x = 0,20 m. O,1vt I o a a a) What is the magnitude and direction (H-i or x) of the net electric field produced by these two charges at the point P that is on the +x-axis at x = rn? 3 N/C Aris. E= 5(ü direction Y b) What is the electric potential at point P produced by these two charges? (Take the potential to be zero at very larges distances from the charges.) I.,3a)cIo 1
2 potential at a point that is on the x-axis at = 0.50 m? is in the +x-direction. If the electric potential at the origin is 300 V, what is the electric a) In a region of space there is a uniform electric field with magnitude 800 N/C and that (10 pts) 2. V, what is the electric potential at point b? force acting on the particle is the electric force. if the electric potential at point a is 300 particle reaches point b. 5.0 m to the right of point a, its kinetic energy is 4.0 J. The only b) A particle with charge q = -8.0 x io C is released from rest at point a. When the 4-SOD V Ana+ 700 q
3 of the other two resistors and what is the emf of the battery? c3. and R3 = 3.0 Q. The voltage across R1 is V1 36 V. What is the voltage across each h) Three resistors are connected to a battery as shown in the sketch. R1 = R9 = 2.0 jj Aiis. Cl (12 pts) 3. a) Three capacitors are Coflflecte(1 to a battery as shown in the sketch. C1 = 1.0 x 10 6 emf= : V = L ) Aiis. V = ernf= LtSO V Q3 = io Q2 What is the charge on each of the other two capacitors and what is the einf of the hattery? F. C2 = 2.0 x 10 F. and Cs = 3.0 x io_6 F. The charge Q on C1 is Qi = 6.0 x 10 C.
4 J1s b) After the switch has been closed a long time. what is the voltage across the 3 resistor? a) Just after the switch is closed. what is the voltage across C L 32L 6 (6 pts) 5. Consider the circuit shown in the sketch. C 5.0 x 10 6 F and L 0.30 H. 2o J Calculate the two battery emfs, and Initially the switch S is open there are no currents, and there is no charge on the capacitor. Then the switch is closed. c (8 pts) -4. Consider the circuit. shown in the sketch. Note that. two currents are shown.
5 oeo. direction 4i 1:; $fl the sketch. The magnetic field is decreasing at a constant rate of B/t = T/s. (.. x I= IyO If is induced in the loop? Wha.t are the fllagnitu(le and (hrection (clockwise or counterclockwise) of the current that. i F= 7fl X)O f\j netic field of the two wires exerts on q? v = 7.0 x io ni/s. What are the magnitude and direction of the net force that the mag C is moving parallel to the wires. iii the opposite (lirection to the currents, with speed tance between the wires is in. A small object. with negative charge q =. 0 (9 pt.s) 7. Two long, straight parallel wires carry currents as shown in the sketch. The dis p Q (lirection (o4 is in a uniform magnetic held that is directed out of the plane on the paper. as shown in (8 pts) 6.Ac ircular loop of wire has ra(lius r 0.20 rn and resistance 10 Q. The loop
6 (9 pts) 8. A series ac circuit has a source with voltage aml)litude V = 120 V and angular freciuencv =.50 rad/s. a resistor with R = 15 2 and an inductor with L = 0.10 H. a) What is the current amplitude? k b) What is the phase angle? Does the source voltage lag or lead the current? Aris. phase angle lag or lead c) \Vhat is tlie rate at which the source is (lelivermg electrical energy to the circuit? kris
7 a) Is the image real or virtual? b) Is the image upright or inverted? (?4 0 r surfaces of the oil film? have destructive interference between the light that is reflected from the upper and lower What wavelengths in air within the limits of the visible spectrum (A = 400 nrn to 700 nm) the water has n = White light in air is incident normal to the surface of the oil. f = +30 cm. (6 pts) 9. An object that is 2 mm tall is placed 10 cm to the left of a thin lens that has c) What is the height of the image? (8 pts) 10. An oil film that is 400 urn thick is on top of water. The oil has n = 1.2 and QE
8 L9;). nuclei? a) How many neutrons are there in the daughter nucleus that is produced by this decay? b) What is the activity in Bq (decays/sec) of a sample that contains 5.0 grams of Au (8 pts) 2. The gold nucleits Au undergoes a-decay with a half-life of 2.70 days. Lithium. Li Beryllium. Be Hydrogen. H I I Lithium. Li Helium. He Helium. He Element Z N u 4 Deutenum,H I Ltomk number, Neutnn number Atomic mass, Mass number 52% MV TABLE O.2 Atomic masses of light elements repro(luce(l below. [se t lie iiiforniation in t lie table to calculate t he of the nucleus Be. total binding energy (6 pts) 11. A portion of Table 30.2 Atomic Masses of Light Elements from the textbook is
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