The unit for the magnetic field strength H can be derived from its relationship to the magnetic field B, B=μH. Since the unit of magnetic permeability μ is N/A 2, then the unit for the magnetic field strength is:
Use a ratiometric linear Hall effect sensor to build simple magnetic field strength meter. Magnetic field is a region around a magnetic material or a moving electric charge within which the force of magnetism acts. This video describe how to make a magnetic field strength meter.
a) The diagram of the magnetic lines of force due to a circular wire carrying current. b) Enhance the number of turns of the wire in the coil and the current flowing through it to increase the strength of the magnetic field produced by the current-carrying circular coil.