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SAMPLEFinalExam

# SAMPLEFinalExam - Name Code UCSD Physics 2B Summer Session...

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Name: _________________________________________ Code # _________ 21 UCSD Physics 2B Summer Session 2 SAMPLE Final Exam HOW TO PREPARE FOR THIS EXAM Make your formula sheets early so you can - a ) Use them while working this Sample Exam b ) Make sure you have everything you'll need You may bring FIVE double-sided sheets to the final However, this is not enough room to include everything! Purge redundant formulas and include only what you really need. It is extremely important to understand what the formulas mean and how they are used. You may want to include notes on properties of e.g., conductors and capacitors and inductors as circuit elements. For example, look at problem # 11 in Part 2 You can work your problems out on scratch paper BUT make sure to re-write them clearly on this exam in brief yet complete form so we can follow your thinking. Remember that you MUST show your work to receive credit PART 1 Multiple Choice 1. Coulomb Force A positive charge of 45.0 nC is 25.0 mm from a negative charge of 63.0 nC. The force on one charge due to the other is approximately A. 2.26 × 10 3 N B. 1.13 × 7 N C. 4.08 × 2 N D. 1.13 × 13 N E. 4.08 × 4 N

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2 2. Charge How many electrons must be transferred to a body to produce a charge of 410 nC? A. 1.25 × 10 7 B. 1.60 × 19 C. 1.28 × + 12 D. 3.45 × + 11 E. 2.56 × + 3. Electric Field A charge q = 23 mC feels a force of 1200 N at a certain point in space. What is the magnitude of the electric field at that point? A. 2.0 × + 4 N C B. 5.2 × + 4 N C C. 2.0 × + 7 N C D. 1.9 × 5 N C E. None of these 4. Potential The potential at a point due to a positive charge is found to be V. If the distance between the charge and the point is reduced to half it's original distance, the potential becomes A. 2 V B. V / 2 C. V / 4 D. 4 V E. 16 V
3 5. Capacitance The equivalent capacitance of two capacitors in parallel is A. the sum of the their capacitances B. the sum of the reciprocals of their capacitances C. the reciprocal of the sum of the reciprocals of their capacitances D. always less than the smallest of their capacitances E. described by none of the above 6. Resistance The equivalent resistance of two identical resistors in parallel is A. twice the resistance of each one B. half the resistance of each one C. the reciprocal the resistance of each one D. the square root of the resistance of each one E. described by none of the above 7. Current If 475 x 10 16 electrons pass a particular point in a wire every minute , what is the current in the wire? A. 760 mA B. 45.6 A C. 12.7 mA D. 79.0 A E. 1.32 A

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4 8. Current Density A wire of radius 3.6 cm is carrying a current of 12 A. What is the current density J in the wire? A. 3.9 A/m 2 3.9 A m 2 B. 4.4 × 10 2 k A m 2 C. 2.9 × 2 A m 2 D. 340 m A m 2 E. 1.2 M A m 2 9. Ohm's Law A heating coil operates at 210 V. If it draws 10.5 Amps, find its resistance. A. 11.1 Ω B. 20.0 Ω C. 50.0 m Ω D. 128 Ω E.
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SAMPLEFinalExam - Name Code UCSD Physics 2B Summer Session...

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