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Load of a series R-L-C circuit is given by R+j(XL-XC).

where R=resistance,XL=reactance,Xc=reactance.

Load will be capacitive if (XL-XC)<0.

or, XC>XL

or,1/(wC)>wL

[w=2*pi*n where n=frequency,C=capacitance,L=inductunce]

therefore

n<1/(2*pi*sqrt(LC))

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