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Image: Magnetic field of wire loop

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Original image(SVG file, nominally 738 × 736 pixels, file size: 68 KB)

Description: Magnetic field lines (red) of a wire loop carrying an electric current I, illustrating how the field lines all pass through the interior of the loop, creating a strong magnetic field there. This explains why coils of wire are used in electromagnets, inductors, and transformers.
Usage Terms: Public domain

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