Anegative charge q = − 3.20 × 10 ^− 6 c q=−3.20×10−6c is located at the origin and has velocity → v = ( 7.50 × 10 4 m / s ) ^ ı + ( − 4.90 × 10 4 m / s ) ^ ȷ v→=(7.50×10^4m/s)ı^+(−4.90×10^4m/s) ȷ^ . at this instant what is the magnetic field produced by this charge at the point x = 0.250 m x=0.250m , y = − 0.330 m y=−0.330m , z = 0 z=0 ?

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?