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is connected to the primary coil of a transformer having 1200 turns. How many turns should the secondary coil have if we want to reduce the voltage to 
?
and a capacitor with a capacitance of 
.
was equal to 
.
and a capacitor with a capacitance of 
. We momentarily connect an 80 V voltage source to the oscillator circuit and turn it off.
. The capacitance of the capacitor is 
.
?
and the natural frequency of the circuit is 
.
