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Physics 2212 Homework 5 (due: March 29) 1. What is the electric potential at the point P? 2. What is the electric potential at the point P? 3. The potential at the center of a 4.0-cm-diameter copper sphere is 500 V, relative to V=0 V at infinity. How much excess charge is on the sphere? 4. Find potential energy for two configurations (a) and (b) shown in Fig. Three particles have the following charges 1 2 3 1 , 5 , 1 q C q C q C = = = . Which configuration has the lower energy? +2 nC P -6 nC 5 cm 5 cm +2 nC 45 45 +1 nC P +2 nC 1 cm 1 cm 1 cm 10 cm 2 q 10 cm 3 q 1 q (b) 10 cm 10 cm 10 cm 3 q 1 q 2 q (a) 5. Point charge 11 q C = is placed at the center of insulating uniformly charged sphere of radius 1 R m = and total charge 16 Q C = . Find electric potential at distance r = 0.8 m from the center of the sphere, assuming that electric potential is 0 very far from the sphere. 6. Point charge q is placed at the center of insulating uniformly charged sphere of radius R=50 cm and total charge Q=5 C . The electric potential at distance r = 20 cm from the center of the sphere is 0. What is the value of the charge q ? 7. A 2.0 mm diameter glass bead is positively charged. The potential difference between the point 2.0 mm from the center of the bead and a point 4.0 mm from the bead is 500 V. What is the charge on the bead? 8. Four particles with charges 1 , 1 , 1 , q C q C q C = = = and 2 Q C = are placed at the vertices of a square of side 10 a c m = . The particle with charge Q and mass 100 m g = is released from the rest. How fast will this particle be moving when it will be at infinite distance from the other particles. 9. Two 1.0 g beads, each charged to +5.0 nC, are 2.0 cm apart. A 2.0 g bead charged to - 1.0 nC is exactly halfway between them. The beads are released from the rest. What is the speed of the positive bead, when they are very far apart? q q q Q ... View Full Document

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