The interaction between moving charges

When electric charges move, they exert forces on one another over and above the electrostatic force. The directions and magnitudes of these forces depend on the speed and direction of motion of each charge and on their relative positions at a given instant.

The concept of a magnetic field makes it much easier to describe these forces, and magnetic lines of force are particularly

Fig 10.16 Charges in motion.

useful in visualising the laws which govern the interaction of moving charges. One must remember that the lines of force and indeed the whole concept of magnetism are only a tool to help the description. The basic entities are electric charges at rest and in motion. There are no such entities as 'magnetically charged particles'. Magnetism has no reality of its own without electricity.

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