CT 27.19bA negative point charge with charge -Q sits in the interior of a thick spherical (conducting) metal shell (which carries 0 net charge).A: -QB: +QC: +2QD: zeroE: Other-QInnersurfaceOutersurfaceGaussiansurfaceWhat is the total charge on the outer surface of the shell?CT 27.19exE=0 (inside)CT 29.2Two parallel conducting plates (a capacitor) are charged as shown. A proton is lifted by an external agent (tweezers) a distance d as shown. Ignore gravity in this problem. (There is a uniform electric field between the plates)++++++++++++++++++++++++++++++++-------------------------------------------------------ProtondE E ˆ y yxA: up B: down C: zeroWhat direction is the force on the proton due to the E-field in the capacitor?CT 29.2dThe sign of the work done by the tweezers is … ?++++++++++++++++++++++++++++++++-------------------------------------------------------ProtondA: + B: - C: zeroD: Not enough infoCT 29.2cThe sign of the work done by the E-field as the proton is moved upwards is…?A: + B: - C: zeroD: Not enough info++++++++++++++++++++++++++++++++-------------------------------------------------------ProtondCT 29.2eChange in potential energy is : If we define U(proton) = 0 at the bottom plate, then U(proton) near the top is...++++++++++++++++++++++++++++++++-------------------------------------------------------ProtondA: + B: - C: zeroD: Not enough infoU Wext WfieldCT 29.4bA positive charge q is moved from position i to position f between the plates of a charged capacitor. E i f +q Did the pot. energy (U) increase or decrease?Did the voltage (V) at the position of the test charge increase or decrease?A: U , V B: U , V C: U , V D: U , VE: None of theseCT 29.4cA negative charge -q is moved from position ito position f between the plates of a charged capacitor. E i f -q Did the pot. energy (U) increase or decrease?Did the voltage (V) at the position of the test charge increase or decrease?A: U , V B: U , V C: U , V D: U , VE: None of these/I’m lostCT 29.8Two test charges are brought separately into the vicinity of a fixed charge +Q. i: +q is brought to point A, "r" away. ii: -q is brought to the same point. i: ii: +Q +Q +q P r P r -q (U=0 and V=0 at ∞)The potential, V, at point P is ...A: Greater for the +q charge in situation iB: Greater for the -q charge in situation iiC: The same for both.CT 29.8bThe potential energy, U of the test charge is greater in situation... i: ii: +Q +Q +q P r P r -q A: iB : iiC: The same for both.CT 29.10Two identical charges, +Q and +Q, are fixed in space. What is the magnitude of the E field, and the value of the voltage, at the midpoint between them?(Assume the potential is zero at infinity.)A) E=0 , V nonzero B) E nonzero , V=0C) Both are 0 D) Both are nonzero+Q +Q(Midpoint)E=?V=?CT 29.10bTwo charges, +Q and -Q, are fixed in space. What is the magnitude of the E field, and the value of the voltage, at the midpoint between them?(Assume the potential is zero at infinity.)A) E=0 , V nonzero B) E nonzero , V=0C) Both are 0 D) Both are nonzero+Q -Q(Midpoint)E=?V=?CT 29.12The equipotential contours around two positive charges (charges 1 and 2) are shown. Which charge is larger?A: charge 1 B: charge 2 C: both the same100V40V15V100V40V15V12CT 29.12bA test charge (+q) is carried from point i to point f at constant speed. The work done by the external force is ..A: + B: -C: zero 40V40V15V100V100V15VifCT 29.12cAn proton is carried from point i to point f at constant speed. . The work done by the external agent isA: +85 eV B: -85 eVC: >+85 eV D: Between 0 and +85eVE: not enough information given40V40V15V100V100V15VifCT 29.13bWhat is the approximate magnitude of the electric field at point A?(Each equipotential line is 2 m from the nearest-neighbor equipotential.)ALine of Charge0V-1.4V-2.1V-1.8VA) 0.1 Volts/mB) 0.2 Volts/mC) 0.4 Volts/mD) 0.6 Volts/mE) None of theseCT 29.14Given the equipotential lines shown, what can we conclude about the E field strengths at A and B?0V10V20V 30VPoint APoint BA) |EA| > |EB| B) |EA| < |EB|C) |EA| = |EB|A large sphere is initially charged with total charge +Q. A wire now connects the large sphere to a small sphere. Once the system comes into static equilibrium, what is the potential on the surface of the spheres? (all objects are conductors)++++++++++++QVAVBA) VA> VBB) VA< VBC) VA=VBHL Pot 1VVA) EA> EBB) EA< EBC) EA=EB=0D) EA=EB≠0HL Pot2How do the magnitudes of the electric fields at the surfaces of the spheres compare? EAEBTwo test charges are brought separately into the vicinity of a charge +Q. Which charge configuration required more work (done by the external agent moving the test charge) to assemble?+Q +q r +Q +2q 2r Pink Green A)B)C) Both required the
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