What defines the direction of magnetic field ?
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The direction of magnetic field lines is defined to be the direction in which the north pole of a compass needle points. If you place a compass near the north pole of a magnet, the north pole of the compass needle will be repelled and point away from the magnet.
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The direction of the force due to a magnetic field is perpendicular to the direction of motion. distance away from the wire, and is called the permeability of free space. Magnetic fields are measured in Teslas(T). The Earth has a magnetic field of about 5e-5 T.
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