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# permeability of free space

Extracts from this document...

Introduction

July 30, 2008

DCP, CE

Phy Lab 14- Permeability of Free Space

Phy HL (Yr ’09)

Procedure:

It was observed that the magnetic field at one point within the solenoid was fluctuating within a relatively large range. To find out the uncertainty in the readings of the magnetic field sensor, we recorded the magnetic field for a period of 10 s. The mean value of the maximum and minimum value was calculated. The deviation from the mean value then became

Middle

13

0.701

-1.3156 ±0.0458

14

0.758

-1.3420 ±0.0560

15

0.809

-1.3638 ±0.0339

16

0.860

-1.3628 ±0.0356

17

0.913

-1.3914 ±0.0379

18

0.950

-1.4186 ±0.0468

19

1.008

-1.4367 ±0.0386

20

1.052

-1.4351 ±0.0390

21

1.090

-1.4711 ±0.0454

Graph of current passing through the solenoid vs magnetic field strength inside the solenoid

Slope of best fit line = -0.406 mT A-1

Maximum slope = -0.289 mT A-1

Minimum slope = -0.497 mT A-1

Thus, slope = -0.406 ±0.117 mT A-1

Where B → Magnetic field strength

→ permeability of free space

Conclusion

The magnetic field was not constant within  the solenoid.If the sensor is kept in one position, the background field of the earth will not affect the magnetic field strength.The sensor measures the component of the magnetic field that is perpendicular to the white dot on the end of the sensor tip.

[1] Obtained from Physics IBO Data Booklet

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

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