Exam 3 (practice problems) 1. What is the electric potential at point P? +4 nC 1.5 cm - 10 nC +2 nC 1 cm P 2 cm -300 V 2. Four particles 5 µC, 5 µC, -2 µC and 10 µC are placed at the vertices of a square of side 20 cm. The particle with charge Q and mass 200 g is released from the rest. How fast will thisDon't forget about the age old question of according to freud, boys are most likely to experience the oedipus complex during the ________ stage.
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particle be moving when it will be at infinite distance from the other particles. 5 µC 10 µC -2 µC 5 µC 6.2 m/s 3. Find potential energy of a system of three points charges shown in the figure. 4 cm +5 µC 3 cm +15 µC -10 µC -35.25 J 4. Two 1.0 g beads, each charged to +5.0 nC, are 2.0 cm apart. A 2.0 g bead charged to - 10 nC is exactly halfway between them. The beads are released from the rest. What are the speeds of the positive beads, when they are 4 cm apart? 0.22 m/s 5. Point charge q is placed at the center of insulating uniformly charged sphere of radius R=80 cm and total charge Q=-10 µC. The electric potential at distance r = 50 cm from the center of the sphere is 0. What is the value of the charge q? 8.15 µC 6. To what potential should you charge a 5.0 μF capacitor to store 1.0 J of energy? 632 V 7. What is the equivalent capacitance between points A and B? 20 µF 10 µF 10 µF 40 µF 40 µF 30 µF A B 15 µF