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# Strength of Magnetic Field

Extracts from this document...

Introduction

Diana Herwono D 0861 006

Physics HL Lab Report:

Experiment to Examine the Strength of a Magnetic Field

by Diana Herwono

Candidate No: D 0861 006

Title:         Experiment to Examine the Strength of a Magnetic Field

Aim:

To examine the relationship between the strength of the magnetic field at different points near a bar magnet by comparing it with the horizontal component of the earth’s magnetic field.

Apparatus:

Bar magnet, compass, ruler, protractor, sheet of paper, masking tape.

Theory:

In this experiment you will place a bar magnet at one end of a sheet of paper, so that the         longitudinal axis of the magnet is perpendicular to the magnetic N-S line in the laboratory. The line showing the axis of the magnet is extended across the paper.

Middle

1. Erect a line perpendicular to the axis of the bar magnet at the point that is farthest from the magnet. This line will mark the N-S line of the earth’s magnetic field.
2. Place the centre of the compass over the intersection of this N-S line and the axis line. Rotate the paper under the compass until the N-S line coincides with the direction of the compass needle. Fix the paper in this position with masking tape.
1. Place the compass with its center on the farthest point on the axis line. Note the direction taken by the compass by marking a dot on the paper at each end of the compass needle. Remove the compass and draw a line between the two dots.

Conclusion

class="c11 c9">2.14

3.74*10-4

42.5

52.0

1.28

5.54*10-4

30.9

33.5

0.66

1.05*10-3

17.8

11.5

0.20

3.16*10-3

5.70

0

0

3.08*10-2

Observations:

As the compass is moved further away from the bar magnet, the magnet’s magnetic field gradually decreases.

At the point for which θ = 45°, the horizontal component of the earth’s magnetic field is the same as the field strength of the bar magnet. The distance from the N-pole of the magnet where the two field intensities are equal is found by drawing a graph with tan θ as the ordinates against the distance d as abscissas. Find the d corresponding to tan 45° = 1 on the graph.

Conclusion:

The relationship between B and the distance from the pole is like this: As distance d increases, the magnetic field intensity B at that point decreases.

This student written piece of work is one of many that can be found in our International Baccalaureate Physics section.

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