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The dispersion properties of low-frequency (in comparison with the ion gyrofrequency) dust-electromagnetic waves in a four-component magnetized dusty plasma have been investigated. It has been shown that the simultaneous presence of positive and negative inertial dust grains introduces new resonance and cut-off for dust-electromagnetic waves, and a sharp forbidden- frequency-band in between the two branches of the propagating dust-electromagnetic waves. The two wave branches have been found to have frequencies of the order of negative and positive dust gyrofrequencies, respectively. The effects of space and laboratory dusty plasma parameters on these newly found resonance and cut-off and on the dispersion properties of the dust-electromagnetic wave branches have also been examined.

New resonance and cut-off for low-frequency electromagnetic waves in dusty magnetoplasmas