Suppose a transformer has 50 windings on its primary and 300 windings on its secondary. If the input voltage (i. e., on the primary) is 40 V, what is the voltage at the output (i. e., on the secondary)

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?