The aim of the experiment
a. Determine the horizontal component of the Earth’s magnetic field
Experiment with the tools
Tangent galvanometer
ammeter
electric switch
DC power supply
Steps to conduct the experiment
Connect devices according to the following Figure. Note that DC supply used in
present work may have a built-in ammeter and a variable source value (you do not
need a separate instrument or rheostat (variable resistor) to control the current.
Orientate inductors axis perpendicular to magnetic needle such that the needle will
direct along the earth’s magnetic field and the produced field will pe perpendicular
to it according to the right-hand rule.
Switch on the power supply and adjust current to starting value given by instructor.
Read and record the angle 𝜽𝟏 after compass needle has stabilized.
Reverse current through inductor with switch K, check that value of current through
inductor remains the same (if not, adjust supply's output voltage) and record the
angle 𝜽𝟐 after compass needle has stabilized again. Record all data to table 1.
Measure angles 𝜽𝟏 and 𝜽𝟐 at 7…10 different given currents and present your
results to instructor for final check.
Calculate the average of angles 𝜽𝟏 and 𝜽𝟐 for every current value assuming both
angles being positive.
Plot the relation between 𝐭𝐚𝐧(𝜽𝒂𝒗𝒆𝒓𝒂𝒈) on the y-axis and current 𝑰 on the x- axis.
It will be straight line of slope given by
Calculate horizontal component of Earth's magnetic field 𝑩𝑬𝒂𝒓𝒕𝒉 after measuring
the values of r and N.
Experiment may be repeated for different values of N .
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