A constant pitch helical coil is made from a length L=7m ofround conductor having a copper core with diameter d=0.1mm andcovered with an insulation of thickness t=0.02m, by winding theconductor on a mandrel having a length Lm=120mm and a diameterdm=3mm and allowing equal leads for connection at the two ends,each with a length l=10mm
Calculate the coil DC resistance if the electrical resistivityof copper is 1.72 µΩcm [marks 2]
Calculate the coil inductance [marks 4]
Calculate the equivalent capacitance of the coil. The relativepermittivity of the conductor insulation is εr = 2.3mm [marks2]
If the coil is attached to a circuit using its leads estimatethe supplementary inductance and capacitance introduced by thisset-up. [marks 3]
Calculate the resonance frequency for the arrangement consideredin d) [marks 1]
