If the magnetic field is measured in the opposite direction it could produce a negative number. Negative reading value means that the field is in the opposite direction of the assumed direction.
The procedure asks us to record the absolute value of magnetic field because it will give us the magnitude of the magnetic field. If the magnetic field is measured in the opposite direction it could produce a negative number.
The negative sign represents the fact that any current generated by a changing magnetic field in a coil produces a magnetic field that opposes the change in the magnetic field that induced it. This phenomenon is known as Lenz's law.
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