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1. What is the equivalent capacitance between points a and b? All capacitors are 3.0 PF- I Comment [ASl]: * Correct answer 1 [ Comment rAS21: Correct answer 1 I Comment [AS3]: ] wo capacitors CI = 20-pF and C2 = 5-pF are connected in series and charged with a 250-V power supply. What is the total energy stored in the two capacitors? 3. A proton is accelerated by a constant electric field of magnitude 360 NIC. Using the equations of motion with constant acceleration find the proton's speed after 1.OO x s, assuming it starts from rest. Correct answer 4. A square loop with sides of length 50 cm is placed in a uniform electric field such that the electric field makes an angle of 30" to the perpendicular direction of the loop. If the electric field strength is 500 N/C what is the electric flux through the loop? 2 C Comment [AS4]: Correct answer \ - C --- d 5. A 50.0-pF capacitor is connected to a 500-V battery. Find the charge on .the capacitor. . 6. A metallic conductor has a resistivity of 19 x a.m. What is the resistance of a piece of this conductor that is 30 m long and has a diameter of 4, ?m = Y. h , = o,D ./ ( K m z 6 1 : Correct answer ] 7. A "sandwich" is constructed of two flat pieces of metal (50.0 cm on a side) with a 1.00-mm-thick piece of a dielectric called Rutile ( K = 100) in between them. What is the capacitance? (a = 8.85 x 10-12c2/N.m2). a. b. c. d. 177 pF 221 nF 8.85 p F 100pF >- I * * - Frnrnent [AS7]: Correct answer 1 8. A charge of +2 C is at the origin. When charge Q is placed at 2 m along the positive x axis, t h e F m ) a t 2 m along the negative x axis becomes zero. What is the value of Q? +2c Q F m e n t [AS8]: Correct answer -- - g ~ ~ u / 9. 200, 0.75-W decorative lightbulbs are connected in parallel on a string of lights which is connected to a 120-V source. What current is delivered to the lights by the source? fl --- -- p m m e n t [AS9]: Correct answer b Y 5 b v 1 ~ ~ , c a c l0.;15-~ , doe, 0.35iJ = ISzlLJ 1 10. An electron is sent at high speed toward a gold nucleus (charge +79e). What is the electrical force acting on the electron when it is 3.0 x 10-l2 m away from the gold nucleus? (e = 1.6 x lo-'' C, k, = 8.99 x 10' N.rn2/c2) rL r - comment [ASIO]:Correct answer /- 11. A 20-R platinum wire at 20°C with a temperature coefficient of resistivity of 4.6 x 10" ("c)-' will have what resistance at 150°C? [comment [ASll]:Comct answer I 1 12. A flashlight bulb operating at a voltage of 1.5-V has a resistance of 12.0 R . How many electrons pass through the bulb filament er secon (e = 1.6 x li)'19 C)? P Comment [ASlZ]: Correct answer '1