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The direction of the magnetic field line in case of a bar magnet at point A & B are
Draw a small bar magnet and show the magnetic field lines as they appear around the magnet. Use arrows to show the direction of the field lines.
What is the magnitude of the magnetic field of the bar magnet in the video when current-carriyng wire is in proximity of magnet? You can assume that the magnetic field is approximately uniform in the region of interest, and that the bar magnet has a width of d = 2.5cm. Current of wire is I=0.738 A and reading on scale is 0.4 g when wire is placed closed to magnet on scale.