An AC series circuit contains a resistor of 20.0 ?, an inductor of 74.0 mH and a variable capacitor. If the frequency of the applied voltage is 423 Hz, to what setting should the capacitor be set if resonance is achieved?
a. 1.89E–5 F
b. 7.66E–6 F
c. 5.09E–6 F
d. 1.91E–6 F
e. 1.91E–5 F
d
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A. 
B. 
C. 
D. 
E. 
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