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<math display="block">\mathbf{H_i} = H_0\sin(\omega_i t)\mathbf{n_H} </math>
where <math>H_0</math> is the magnitude of the intensity, <math>\omega_i</math> is the frequency of the time varying field and </math>n_H</math> is a unit vector pointing in the direction of the field intensity. By placing a sensor at this point in space, the magnetic flux intersecting the sensor can be written as
<math display="block">\Phi_i = \mu_0\mu_r A H_0\sin(\omega_i t)\mathbf{n_H . n_A}</math>
