The magnetic field in the picture below is uniform and points upward. A wire is normal to the page (going into and out of the paper or computer screen you are looking on). The distance from the wire to point #2 is 1cm. When the wire carries a current, the net magnetic field at point 2 is zero. Point 1 is the same distance from the wire as point 2. Use a vector diagram to determine the net magnetic field at point 1 when the current is on. Point 3 is twice as far from the wire as point 2. Use a vector diagram to determine the net magnetic field at point 3 when the current is on.  If the magnetic field at point 3 is 1.0x10-4 T, how much current is flowing in the wire?

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Bar Magnet

In physics, magnetism is a phenomenon exhibited by a magnetic substance that exerts either attractive or repulsive force. A bar magnet is either a rectangular or round and hollow fit comprised of ferromagnetic materials and has a fanciful attractive field surrounded by it.