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Loading Coil (B Series):
The loading coil is a kind of coil (inductor) that is inserted in a circuit to increase its inductance. Loading coil inserted periodically in series with a pair of wires reduce the attenuation at the higher voice frequencies up to the cutoff frequency of the low-pass filter formed by the inductance of the coils and distributed inductance of the wires, and the distributed capacitance between the wires. Above the cutoff frequency, attenuation increases rapidly.
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