Table of contents

0. Math Review31m
- Math Review
  31m
1. Intro to Physics Units1h 29m
2. 1D Motion / Kinematics3h 56m
3. Vectors2h 43m
4. 2D Kinematics1h 42m
5. Projectile Motion3h 6m
6. Intro to Forces (Dynamics)3h 22m
7. Friction, Inclines, Systems2h 44m
8. Centripetal Forces & Gravitation7h 26m
9. Work & Energy1h 59m
10. Conservation of Energy2h 54m
11. Momentum & Impulse3h 40m
12. Rotational Kinematics2h 59m
13. Rotational Inertia & Energy7h 4m
14. Torque & Rotational Dynamics2h 5m
15. Rotational Equilibrium3h 39m
16. Angular Momentum3h 6m
17. Periodic Motion2h 9m
18. Waves & Sound3h 40m
19. Fluid Mechanics4h 27m
20. Heat and Temperature3h 7m
21. Kinetic Theory of Ideal Gases1h 50m
22. The First Law of Thermodynamics1h 26m
23. The Second Law of Thermodynamics3h 11m
24. Electric Force & Field; Gauss' Law3h 42m
25. Electric Potential1h 51m
26. Capacitors & Dielectrics2h 2m
27. Resistors & DC Circuits3h 8m
28. Magnetic Fields and Forces2h 23m
29. Sources of Magnetic Field2h 30m
30. Induction and Inductance3h 38m
31. Alternating Current2h 37m
32. Electromagnetic Waves2h 14m
33. Geometric Optics2h 57m
34. Wave Optics1h 15m
35. Special Relativity2h 10m

24. Electric Force & Field; Gauss' Law

Electric Charge

Physics

24. Electric Force & Field; Gauss' Law

Electric Charge

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Multiple Choice

A negatively charged rod is brought close to (but does not touch) two neutral spheres that are in contact with each other but insulated from the ground. If the two spheres are then separated, what kind of charge will be on the spheres?

Both spheres will be negatively charged.

The sphere closer to the rod will be positively charged, and the other sphere will be negatively charged.

The sphere closer to the rod will be negatively charged, and the other sphere will be positively charged.

Both spheres will be positively charged.

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Verified step by step guidance

Understand the concept of electrostatic induction: When a charged object is brought near a conductor, it causes a redistribution of charges within the conductor without direct contact.

Identify the initial condition: Two neutral spheres are in contact, meaning they can share charges freely between them.

Consider the effect of the negatively charged rod: The presence of the rod will repel electrons in the spheres, causing electrons to move away from the side of the sphere closest to the rod.

Analyze the charge distribution: The sphere closer to the rod will have a deficit of electrons (positive charge), while the sphere further away will have an excess of electrons (negative charge).

Separate the spheres: Once the spheres are separated while the rod is still nearby, the charge distribution is locked in place. The sphere closer to the rod remains positively charged, and the other sphere remains negatively charged.