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Why is it important to align the Helmholtz coil, so that its field is anti-parallel to...

Why is it important to align the Helmholtz coil, so that its field is anti-parallel to the earth's magnetic field?

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Answer #1

Helmholtz coils are used in varies experiments to cancel out the effects of external magnetic fields on the apparatus or experimental set up which in this case is the earth's magnetic field.

In order to cancel out earth's magnetic field and create a net zero magnetic field inside the coil region we need to align the Helmholtz coils such that their fields are anti-parallel to that of the earth. However the value of the current flowing inside the coil is completely dependent on the value of earth's magnetic field at that particular point.

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