![]() Coulomb then turned the knob at the top, which allowed him to rotate the thread, thus bringing sphere A closer to sphere B. This force would cause sphere A to rotate away from sphere B, thus twisting the wire until the torsion in the wire balanced the electrical force. An unknown amount of charge would distribute evenly between spheres A and B, which would then repel each other, because like charges repel. Coulomb would touch the spheres with a third metallic ball (shown at the bottom of the diagram) that was charged. When no charge is on this sphere, it touches sphere B. At one end of the rod is the metallic sphere A. This device, shown in Figure 18.15, contains an insulating rod that is hanging by a thread inside a glass-walled enclosure. ![]() Doing so required careful measurements of forces between charged spheres, for which he built an ingenious device called a torsion balance. More than 100 years before Thomson and Rutherford discovered the fundamental particles that carry positive and negative electric charges, the French scientist Charles-Augustin de Coulomb mathematically described the force between charged objects. Discuss how Coulomb described this law long after Newton described the law of universal gravitation.Īsk why the law of force between electrostatic charge was discovered after that of gravity if gravity is weak compared to electrostatic forces. The differences include the restriction of positive mass versus positive or negative charge. ![]() The similarities include the inverse-square nature of the two laws and the analogous roles of mass and charge. This section presents Coulomb’s law and points out its similarities and differences with respect to Newton’s law of universal gravitation. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |