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physics_6c_su08_exam_2_solutions

# physics_6c_su08_exam_2_solutions - a 9%“ N wail(23‘th...

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Unformatted text preview: a 9%“; N '* wail } (23‘th 1. (10 points) Two ﬂat plates of copper each of area 100. cm2 are separated in vacuum by 1.00 mm. a) What is the capacitance of the plates? b) A charge of 1.00 x 10'10 C is moved from one plate to the other. What is the magnitude of the electric ﬁeld between the plates? c) What is the potential difference between the plates? (1) Suppose now a plate of glass with dielectric constant K = 10.0 is inserted in between the copper plates, ﬁlling the space. What is the capacitance, the magnitude of the electric ﬁeld, and the potential difference between the plates now? Assume the charge on the plates is unchanged. ' 2. (10 points) A battery and (non-identical) bulbs are connected as below. The battery has negligible internal resistance. 4.0 Q a) Find the current through and voltage across each bulb. b) Which bulb burns brightest? (Hint: compute the power dissipated in each bulb). 55“»: 3... {95’}: ‘ ‘4 A” Lu? :3 *2“ “i 3 “3 ‘ *3 w % ¢ a; \$3. . r. E w" 2 y V f- 5:} fife M “a,” n? on 3 3. (10 points) Switch S Position 1 ' Position 2 100.0 nF 100.0 V 20.0 kg The switch is initially in Position 1 and the capacitor is uncharged. The switch is then thrown to Position 2. a) Immediately after the switch is thrown to Position 2, what is the voltage across the capacitor? The charge on the capacitor? What is the voltage across the resistor? What is the current through the resistor? b) A long time after the switch is thrown, what is the voltage across the capacitor? The charge on the capacitor? What is the voltage across the resistor? What is the current through the resistor? c) How long does it take for the current through the resistor to fall to (l/e) of its initial value (the value in part a))? After a long time, the switch is thrown back to Position 1. (1) Immediately after the switch is thrown back to Position 1, what is the voltage across the capacitor? The charge on the capacitor? What is the voltage across the resistor? What is the current through the resistor? e) A long time after the switch is thrown back, what is the voltage across the capacitor? The charge on the capacitor? What is the voltage across the resistor? What is the current through the resistor? f) What is the current through the resistor 2.00 ms after the switch is thrown back to Position 1? ' £3“ (Q ~ ; B if“; ta» 51w“ W k3 "3:33 'l/CM? a a. M \$ £33 . l W " 2 , F“ V in Q T ﬂ 5313‘ {33: / l. g R a .9 £0 WW; {I} \3 g q r ‘ M a *5;— Jféégirw .. tvéx‘vgé alaﬁghjiup x VP‘ » Q} 3:?“ 1 LI, (f. h f i i n M ...
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