Final_B - PHYSICS 1B FINAL FALL QUARTER 2005 B YOUR NAME _...

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PHYSICS 1B FINAL FALL QUARTER 2005 B YOUR NAME _________________________________________________________________ YOUR UCSD STUDENT IDENTIFICATION NUMBER_____________________________ INSTRUCTIONS: THERE ARE 30 QUESTIONS ON THIS QUIZ. PLEASE FILL IN THE SCANTRON FORM USING A NUMBER 2 PENCIL. PUT YOUR NAME AND THE IDENTIFICATION NUMBER YOU WERE ASSIGNED IN THE SPACES ABOVE. 1 page of notes is allowed. NO BOOKS CELL PHONES, LAPTOPS ALLOWED. CALCULATORS ARE OK. 1. A metallic object holds a charge of 3.8 10 6 C. What total number of electrons does this represent? ( e = 1.6 10 19 C is the magnitude of the electronic charge.) a. 4.2 10 14 b. 6.1 10 13 c. 2.4 10 13 d. 1.6 10 14 2. If = 20 V, at what is the power dissipated in the 20- resistor? a. 6.5 W b. 1.6 W c. 15 W d. 26 W 40 30 30 20 30 3. The current in an electron beam in a cathode-ray tube is measured to be 70 μ A. How many electrons hit the screen in 5.0 s? ( e = 1.6 10 19 C) a. 2.2 10 11 electrons b. 8.8 10 13 electrons c. 2.2 10 15 electrons d. 8.8 10 18 electrons 4. A uniform 4.5-T magnetic field passes through the plane of a wire loop 0.10 m 2 in area. What flux passes through the loop when the direction of the 4.5-T field is at a 30 angle to the normal of the loop plane? a. 5.0 T m 2 b. 0.52 T m 2 c. 0.39 T m 2 d. 0.225 T m 2 5. A 12-V battery is connected in series with a switch, 6.0- resistor and coil. What energy is stored in the coil when the current is 2.0 A? The time constant is 4.0 10 4 s. a. 4.8 10 3 J b. 9.6 10 3 J c. 14 10 3 J d. 29 10 3 J
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6. Which process will double the power given off by a resistor? a. doubling the current while doubling the resistance
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Final_B - PHYSICS 1B FINAL FALL QUARTER 2005 B YOUR NAME _...

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