Solve the questions below A coil of inductance 79 mH and unknown resistance and

Question

Solve the questions below

A coil of inductance 79 mH and unknown resistance and a 0.94 mu F capacitor are connected in series with an alternating emf of frequency 980 Hz. If the phase constant between the applied voltage and the current is75 degree, what is there resistance of the coil? Ohm What resistance R should be connected in series with an inductance L = 200 mH and capacitance C = 10.0 mu F for the maximum charge on the capacitor to decay to 99.0% of its initial value in 50.0 cycles? (Assume omega' omega.) Ohm

Explanation / Answer

12)

cos75=R/Z

Z=sqrt((wL)^2+1/(wC)^2)=516.214

So

R=133.606 ohms

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