What is the value of the charge q?

What are the speeds of the positive beads, when they are 4 cm apart?

What is the electric potential at point P?

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