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The magnetic field of an infinite, current carrying wire is determined for any point in space, by applying the principle of superposition of magnetic fields.

**Click** on to go on step by step.

- To illustrate the geometric construction based on the principle of superposition and the symmetry of the distribution.
- To visualize the projections that go into obtaining the vector sum.
- To pass back and forth between vectors and lines of force.
- To observe the link between the electric field and the mapping of the lines of force.