What value of resistor R gives the circuit in the figure above a time constant of 20

A 25.0 nF capacitor is connected across an AC generator that produces a peak voltage of 5.90 V. At what frequency  is the peak current 42.0 mA?

A 22.0 nF capacitor is connected across an AC generator that produces a peak voltage of 4.30 V. At what frequency  is the peak current 42.0 mA?

LC circuits: A charged capacitor is connected to an ideal inductor. At time t = 0, the charge on the capacitor is equal to 6.00 μC. At time t = 2.00 ms the charge on the capacitor is zero for the first time. What is the amplitude of the current at that same instant?

A small bar magnet experiences a 1.50×10−2 N

Meters: A galvanometer has an internal resistance of 100 Ω and deflects full-scale at a current of 2.00 mA. What size resistor should be added to it to convert it to a millivoltmeter capable of reading up to 400 mV, and how should this resistor be connected to the galvanometer?

Potential due to point-charges: A -7.0-μC point charge has a positively charged object in an elliptical orbit around it. If the mass of the positively charged object is 1.0 kg and the distance varies from 5.0 mm to 20.0 mm between the charges, what is the maximum electric potential difference through which the positive object moves? (k = 1/4πε0 = 8.99 × 109 N ∙ m2/C2)

Energy in capacitors: A 1.0 μF capacitor has a potential difference of

Assume that a 7.0 cm diameter, 110 W light bulb radiates all its energy as a single wavelength of visible light. (

The figure shows a 15-cm-diameter loop in three different magnetic fields. The loop’s resistance is 0.18