Two charges, +q and −q, occupy two corners of an equilateral triangle, as shown in (figure 1). if q=1.5mc and r=0.80m, find the magnitude and direction of the electric field at point a, the other vertex of the triangle. let the direction angle be measured counterclockwise from the positive x axis.

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?

Aspecified volume of space contains an electric field for which the magnitude is given by e=e0cos(ωt). suppose that e0 = 20 v/m and ω = 1.0 × 107 s−1. part a what is the maximum displacement current through a 0.80 m2 cross-sectional area of this volume? express your answer with the appropriate units. idisp,max i d i s p , m a x = nothing nothing request answer part b how would this area have to be oriented relative to the electric field to get this maximum displacement current?