Along solenoid with radius b and n turns per unit length has a time-dependent current i(t) in the φ direction. find the electric field at a distance r from the axis, both inside and outside the solenoid. you may assume the quasistatic approximate is valid.

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

In a classical model of the hydrogen atom, the electron moves around the proton in a circular orbit of radius 0.053 nm. what is the electron's orbital frequency? what is the effective current of the electron?