CT 27 19b A negative point charge with charge Q sits in the interior of a thick spherical conducting metal shell which carries 0 net charge What is the total charge on the outer surface of the shell A Q Outer surface Q Gaussian surface Inner surface B Q C 2Q D zero E Other CT 27 19ex E 0 inside CT 29 2 Two 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 E E y What direction is the force on the proton due to the E field in the capacitor A up y B down C zero d x Proton CT 29 2d The sign of the work done by the tweezers is A B D Not enough info C zero d Proton CT 29 2c The sign of the work done by the E field as the proton is moved upwards is A B D Not enough info C zero d Proton CT 29 2e Change in potential energy is U Wext W field If we define U proton 0 at the bottom plate then U proton near the top is A B D Not enough info C zero d Proton CT 29 4b A positive charge q is moved from position i to position f between the plates E of a charged capacitor Did the pot energy U increase or decrease f 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 V E None of these i q CT 29 4c A negative charge q is moved from position i to position f between the plates of a charged E capacitor Did the pot energy U increase or decrease Did the voltage V at the position of the test charge increase or decrease f A U V B U V C U V D U V E None of these I m lost i q CT 29 8 Two 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 q Q U 0 and V 0 at i P The potential V at r point P is A Greater for the q Q q ii charge in situation i P r B Greater for the q charge in situation ii C The same for both CT 29 8b The potential energy U of the test charge is greater in situation A i i q Q P r B ii C The same for both ii Q q r P CT 29 10 Two 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 Q E V Q Midpoint A E 0 V nonzero C Both are 0 B E nonzero V 0 D Both are nonzero CT 29 10b Two 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 Q E V Q Midpoint A E 0 V nonzero C Both are 0 B E nonzero V 0 D Both are nonzero CT 29 12 The equipotential contours around two positive charges charges 1 and 2 are shown Which charge is larger 40V 1 100V 15V A charge 1 B charge 2 C both the same 2 100V 40V 15V CT 29 12b A test charge q is carried from point i to point f at constant speed The work done by the external force is i 40V 100V 15V A C zero 100V 40V B 15V f CT 29 12c An proton is carried from point i to point f at constant speed The work done by the external agent is i 40V 100V 15V f 100V 40V 15V A 85 eV B 85 eV C 85 eV D Between 0 and 85eV E not enough information given CT 29 13b What is the approximate magnitude of the electric field at point A Each equipotential line is 2 m from the nearestneighbor equipotential A 0 1 Volts m B 0 2 Volts m C 0 4 Volts m D 0 6 Volts m E None of these A Line of Charge 0V 1 4V 1 8V 2 1V CT 29 14 Given the equipotential lines shown what can we conclude about the E field strengths at A and B Point B Point A A EA EB C EA EB 0V 10V 20V 30V B EA EB HL Pot 1 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 Q VA A VA VB B VA VB C VA VB VB HL Pot2 How do the magnitudes of the electric fields at the surfaces of the spheres compare EA V A EA EB B EA EB C EA EB 0 D EA EB 0 EB V 25 3 Two 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 A r Pink Q 2q B 2r Green C Both required the same work
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