An aluminum can and a metal house key touch. The can has initial charge of 25 C and a voltage of 3 V. The key starts with a voltage of -5 V and a charge of -10 C. After they touch, the can has a voltage of 2 V, what is the voltage in the keys and why?

If element x has 99 protons how many electrons does it have

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

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.