The electric field strength of the very long charged wire the linear charge density of the wire and as well as the force on the proton from that wire. Therefore, when the charge density is doubled, the proton would experience the same force magnitude if the distance between it and the wire is .

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?