Write experiment on “To Find Direction Using Bar Magnet”.
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Experiment 5: Magnetic Fields of a Bar Magnet and of the Earth OBJECTIVES 1.To examine the magnetic field associated with a bar magnet and construct the magnetic field lines. 2.To measure the magnitude and approximate orientation of the Earth’s magnetic field in classroom. INTRODUCTION In these exercises, you will study the magnetic field of bar magnets and the earth. You will draw field lines and analyze their meaning. You will measure the Earth’s magnetic field in classroom. PROCEDURE Part 1: Constructing Magnetic Field Lines of a Bar Magnet Tape a piece of brown paper (provided) onto your table. Stay far away from any iron objects. Place a bar magnet about 3 inches from the far side of the paper, as shown in Figure 1. Trace the outline of the magnet on the paper. 7 3 inches, more or less Figure 1 Setup for constructing magnetic field lines of a bar magnet Determine which ends of your magnet are north or south magnetic poles. Take one of your small compasses. The arrow on the compass is magnetic and will experience a torque so that the North pole of the compass will point in the direction of the Earth’s magnetic field if no other magnetic fields are present. As depicted in Figure 2, the North pole of the compass points towards the South magnetic pole of the Earth which is very close to the Earth’s geographic North Pole. E05-1
Figure 2 Earth’s magnetic pole and compass heading. It also means that, if you place the compass near the bar magnet, the North pole of your compass will point toward the South pole of the bar magnet or away from the North pole when placed as shown in Figure 3. Figure 3 Direction of the compass when placed near a bar magnet Mark the North and South magnetic poles of your magnet on the paper. Make sure you stay away from any other magnets, electrical circuits or iron materials as you do this
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