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physics_6c_su09_exam_2_solutions

physics_6c_su09_exam_2_solutions - ‘H’ri é{SO 0...

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Unformatted text preview: ‘H’ri é {SO 0 Ci (Za‘c‘é-ox I“ 1. (30 points) Two flat plates of copper each of area 16.0 cm2 are separated in vacuum by 2.00 mm. a) What is the capacitance of the plates? b) A charge of 5.00 x 10'9 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? d) Suppose now a plate of mica with dielectric constant K = 5.00 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. m a w~- x. W x m Magi W “13’” if it“ 7' OK i,3 f: i0 \ 3’” w w 3/10 vmfiq “353 mm“- ? 3 2. (30 points) A battery and (non—identical) bulbs are connected as below. The battery has negligible internal resistance. 8.0 Q a) Find the current through and voltage across each bulb. b) Which bulb burns brightest? (Hint: compute the power dissipated in each bulb). “'15 .5"? if” 4‘45255'»? We” “(L 7'“ V. 0,51» , 7 2),: Ll “£2” 5‘“ W‘s} “k 8‘51“ ( L,w n. m V A» if a . . 7a; " ("0 -~ V cf“? M W. ram smirk " 9 > l} ‘ XLKV‘ “‘3 Lg ‘/ a; i. was ; 3 l” a“ it; I ,9“ j: W iv; f W A e r “(A b» 7 - K1”. *5“ ¢ Wm M W 4 Mg; :3 “z; t 1. w ”" 3. (40 points) Four capacitors are connected to a battery as shown below. a) What is the equivalent capacitance of the four capacitors? b) How much charge flowed out of the battery? c) What is the charge on each capacitor? d) What is the potential difference Vab? 3 .00 “F ...
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