Question: The relation between the ?g, ?c, ?0 is given by __
Options
A : \frac{1}{?_0} =\sqrt{\frac{1}{?_g^2} +\frac{1}{?_c^2}}
B : \frac{1}{?_g}=\frac{1}{?_0^2} -\frac{1}{?_c^2}
C : \frac{1}{?_0} =\sqrt{\frac{1}{?_g^2} -\frac{1}{?_c^2}}
D : \frac{1}{?_g}=\frac{1}{?_0^2} +\frac{1}{?_c^2}
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