salter Posted January 17, 2009 Share Posted January 17, 2009 (edited) I was looking up formulas for inductance of a coil with an air core and i found this one. L=(r^2*n^2)/(9r+10l), where L is inductance, r is radius of coils, n is number of coils and l is length of coil... what is length of coil? is it total conductor in the coil? also, i need to calculate resonance of an LC circuit. i got the formula R=1/2pi(LC)^1/2... does current or voltage affect resonance? does resistance? Edited January 17, 2009 by salter Link to comment Share on other sites More sharing options...
tvp45 Posted January 17, 2009 Share Posted January 17, 2009 I don't know that formula, but l is the axial length of the coil. Voltage and current don't affect resonance unless the voltage is high enough to saturate the inductor core. Resistance affects the Q but not the frequency. Link to comment Share on other sites More sharing options...
chitrangda Posted January 24, 2009 Share Posted January 24, 2009 Net reactance at resonance will be zero. X=Xl-Xc=0 i.e; circuit will be resistive and there will be no phase difference between voltage and current. => [math]\phi[/math]=0 Link to comment Share on other sites More sharing options...
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