IB 33: Magnetic Fields

By: Nicholas Sudharta

Physics 11

Ibu Sheila

Data Collection______________________________________________________________

Data Processing______________________________________________________________

Average field strength:                                     B= Field strength at a distance        

We find the average field strength by using average function in Microsoft Excel.

To find the uncertainty, we use standard deviation or STDEV in Microsoft Excel to the data range in each trial.  

Standard Deviation Formula:

To graph:

Graph (including uncertainties):

From the graph, my hypothesis is that Field Strength is inversely proportional to Distance. The aim of the experiment is to find the relationship between distance and magnetic field strength.

Join now!

By the hypothesis, we use this model formula:.

As from the graph shows,

To find the order or  from the model formula we log the equation.

As so:

Next, from that logged model formula we use linear regression to find the value of .

Firstly, take the existing data and log the values in Microsoft Excel.  

New logged data:

Secondly graph the data using chart wizard (including a linear trend line)*:

*In the graph, we ignore the uncertainties as it does not affect the equation shown on the chart.

Thirdly, ...

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