HW physics 2212 PDF

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Physics 2212 Homework 3 (due: January 24) 1. A plastic rod is charged to -90 nC by rubbing. How many electrons have been added to the rod? 2. Two identical metal spheres A and B are connected by a metal rod. Both are initially neutral. 5.0x1010 electrons are added to sphere A, then the connecting rod is removed. Afterward, what are the charge of sphere A and the charge of sphere B. 3. Two 5.0 g spheres are charged equally and placed 4.0 cm apart. When released, they begin to accelerate at 2 m/s2. What is the magnitude of the charge on each sphere? 4. What is the magnitude of the force on -5nC charge?

-5 nC 1 cm

1 cm

+6 nC

+6 nC

1 cm

5. What is the magnitude of the force on 4nC charge?

+4 nC 1 cm

1 cm

+5 nC

1 cm

- 5 nC

6. What is the magnitude of the force on -20 nC charge?

3 cm +5 nC 1 cm

-4 nC

-20 nC

7. What is the magnitude of the force on the 2 nC charge?

-5 nC +6 nC

+6 nC 5 cm 5 cm 450 450

5 cm

+2 nC 8. Charge q2 is in static equilibrium. What is q1?

q1

q2

-4 nC

20 cm

20 cm

9. Two 5.0 g spheres on 2.0-m-long threads repel each other after being equally charged. What is the charge q?

2m

0 450 45

2m 10 g

10 g q

q...