COULOMB'S LAW , ELECTRIC FIELD , ELECTRIC FLUX

1. Determine the magnitude and direction of the electric force on the electron of a hydrogen atom exerted by the single proton (02 = +e) that is the atom's nucleus. Assume the average distance between the revolving electron and the proton is r = 0.53x10A-1O m. What is the magnitude of the electric force of attraction between an iron nucleus (q = +26e) and its innermost electron if the distance between them is 1.5x10A12 m 5_ Two coins lie 1.5 m apart on a table. they carry identical charges. approximately how large is the charge on each if a coin experiences a force of 2 N? * 4, A helium nucleus has charge +2e, and a neon nucleus +10e. where e is the quantum of charge, 1.6Ox10A-19 C. Find the repulsive force exerted on one by the other when they are 3.0 nanometers (1nm = 10"-9 m) apart. Assume the system to be in vacuum. * 5. In the Bohr model of the hydrogen atom, an electron (Ol=-e) circles a proton (02=e) in an orbit of radius 5.3x10"-11 m. The attraction of the proton for the electron furnishes the centripetal force needed to hold the electron in orbit. Find (a) the force of electrical attraction between the particles and (b) the electron's speed. The electron mass is 9.1x10"31 kg. 1, What is the electric flux of a uniform electric field E = 8000 N/C passing through a flat square A = 10 m"2? * 2 Determine the electric flux through a rectangle of sides 5cm and 10 cm kept in the region of uniform electric field 100 N/C if 0 = 60 * 5- Determine the electric flux through a rectangle of sides 5cm and 10 cm kept in the region of uniform electric field 100 MC if e = 0 * 1. Compute the electric field E in air at a distance of 300m from a point charge Q1 = 5x10"-9 * 2_ A point charge of -3.0x10"-5 C is placed at the origin of coordinates. Find the electric field at the point x=5m on the x-axis. * 5. The electric force on a toner particle of charge is q = 20e is F=qE. where E is the needed electric field. This force needs to be at least as great as twice the weight (mg) of the particle. *