Exam II review RII 1 How many ohms in a coulomb A one gazillion B one coullion D None of these C 17 RII 2 Consider a positive point charge Q just outside an imaginary sphere as shown How does the magnitude of the v v da compare to electric flux thru the left half of the sphere E Left v v E da the magnitude of the electric flux thru the right half Right A Flux Left Flux Right B Flux Left Flux Right C Flux Left Flux Right Q RII 3 Consider a point charge Q off center within a spherical metal shell Does Gauss s Law allow you to compute the total charge on the inside surface of the shell Q A Yes B No RII 4 A point charge q is brought from infinity to a point b near 3 other charges Q Q and 2Q The charge q is brought along 3 different paths in turn path 1 path 2 and path 3 as shown Along which path is the most work done by the external agent carrying the charge q A 1 B 2 C 3 2Q D Same work on all three paths Q path 1 b Q path 3 path 2 RII 5 TRUE A or FALSE B If the E field throughout a region of space is zero the voltage throughout that region must be zero RII 6 TRUE A or FALSE B If the voltage throughout a region of space is zero the E field throughout that region must be zero RII 7Does the capacitance of a capacitor depend on the charge Q on the capacitor A Yes B No C Depends on the type of capacitor RII 8A capacitor is attached to a battery which maintains a constant voltage V across the capacitor plates While the battery is attached the plates are moved further apart The energy stored in the capacitor A increased V B decreased C remained constant Hint U 1 2 QV 1 2 Q2 C 1 2 CV2 RII 9 A charged capacitor is isolated so no charge can get on or off The plates of the capacitor are slowly pulled apart After the plates are pulled apart a bit the electric field between the plates A increased B decreased C remained constant The voltage difference between the plates A increased B decreased C remained constant The capacitance A increased B decreased C remained constant RII 10A copper wire and an aluminum wire both have the same dimensions same length same cross sectional area Which one statement is true A Both wires have the same resistance R and the same resistivity B The wires have different R and different C The wires have the same R but different D The wires have different but the same R RII 11 Which has higher resistance A 100 W bulb B 60 W bulb C Same R in both Hint P IV I2R V2 R RII 12The voltage between points a and b in the circuit shown is measured with an ideal voltmeter What does the voltmeter read Hint Recall that an ideal a R R voltmeter has infinite internal resistance V R A V 2 C V 4 B V 3 D zero E V b RII 13 Consider the circuit below What is the total resistance which the battery sees I 1V R 1 2 2 1 R2 2 A 1 B 2 C 0 5 D 0 25 In the circuit above the resistor R2 is increased to 5 What happens to the current through from the battery A increases B decreases C remains constant RII 14 In the circuit below which resistors must have the same current flowing through them Do not assume that the resistors are identical 1V A R2 R5 only R2 R1 R3 R4 R5 B R3 R4 only C R2 R5 and R3 R4 only D R1 R2 R5 only Which resistors have the same voltage drop A R2 R5 only B R3 R4 only C R2 R5 and R3 R4 only D R1 R2 R5 only RII 15 How many following statements is are true about the following circuits Assume all batteries and all bulbs are identical I Bulb A does not turn on because the voltage difference across it is zero II Bulb B does not turn on because the voltage difference across it is zero III Bulb C does not turn on because the current flowing through it is zero Answer All three are true I is true II is true III is true RII 16 What is the correct order for the total power dissipated in the following circuits from least to greatest Assume all bulbs and all batteries are identical Ignore any internal resistance of the batteries a A B C D E b D C B E A c D B E A C d A B D C E e B A C D E Answer Assume that all bulbs have same resistance R and all batteries have same voltage V The total resistances are A 3R B R since 2 of the R are shorted by the wire C R D R 3 E R The total voltages are A V B V C V since batteries in parallel D V E 2V since batteries in series The total power is Ptot Vtot2 Rtot A P V2 3R B V2 R C V2 R D V2 R 3 E 2V 2 R So A B C D E
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