Magnetic field - Wikipedia

A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetized materials. In everyday life...

Magnetic fields of currents

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Solved: The Magnetic Field Lines Around A Current-carrying...

Magnetic Field of a Current Carrying Wire - YouTube

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What Happens to a Current-Carrying Wire in a Magnetic Field?

Magnetic field lines about a current-carrying wire? | Yahoo Answers

A. Magnetic field lines are ALWAYS in closed loops by definition. The field line is an imaginary line where the field is at a constant strength, therefore if it wasn't a closed loop, the field at infinity won't be zero, which makes no sense for a line charge.