Calculate the electric potential energy in a capacitor that stores 1.0 × 10-10 C of charge at 100.0 V. Use PE = "QAV.
A. 1.0 x 10-8 j
B. 5.0 x 107 J
C. 5.0 x 10-9 J
D. 1.0 x 102 J

Consider a uniformly charged ring in the xy plane, centered at the origin. the ring has radius a and positive charge qdistributed evenly along its circumference. a)what is the direction of the electric field at any point on the z axis? . b)what is the magnitude of the electric field along the positive z axis? use k in your answer, where k=14πϵ0. d)the ball will oscillate along the z axis between z=d and z=−d in simple harmonic motion. what will be the angular frequency ω of these oscillations? use the approximation d≪a to simplify your calculation; that is, assume that d2+a2≈a2. express your answer in terms of given charges, dimensions, and constants