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  9. A wire of resistance R...
A wire of resistance R is coiled inductively so that its inductance is L. The impedance of the coil at a frequency of f is_______________?

(R+2?fL)

R+1/2?fL

(R2+f2L2)

(R2+4?2f2L2)

Answer: D . (R2+4?2f2L2)
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