و By assuming that a hydrogen atom consists of an electron of charge ē orbiting a proton of charge e calculate the ratio of the electric force between
the electron and the proton to the gravitational force between them. [Given that mass of ē = 9.1 x 10^-31kg, mass of e= 1.64×10^-27kg, G = 6.67×10^-11]

Which graph best represents the relationship between the electric current and the rate at which a magnet is turning inside an electric generator?

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

Ann walks 80 meters on a straight line 33 ∘ north of east starting at point 1. draw ann's path. represent ann's walk with a vector of length 80 meters. draw the vector starting at point 1. the length given in the display is in meters.