Electrons

An electric dipole consists of charges +2e and -2e separated by 0.78 nm. It is in an electric field of strength 3.4 x 10^6 N/C. Calculate the magnitude of the torque on the dipole when the dipole moment is (a) parallel to (b) perpendicular to (c) antiparallel to the electric field. What is the difference between potential energies for dipole orientations parallel and antiparallel to the electric field?

A uniformly charged disk carries charge with a given density. Calculate the electric field on the axis of the disk at different points.

A uniformly charged disk of radius 35.0 cm carries charge with a density of 7.90 x 10^-3 C/m^2. Calculate the electric field on the axis of the disk at (a) 5.0 cm, (b) 10.0 cm, (c) 50 cm and (d) 200 cm from the center of the disk.

Protons

A proton is projected in the positive x-direction into a region of uniform electric field, E = -6.0 x 10^5 i N/C at t = 0. The proton travels 7.0 cm as it comes to rest. Determine (a) the acceleration of the proton, (b) its initial speed, and (c) the time interval over which the proton comes to rest.

Electric Field

A solid sphere of radius 40.0 cm has a total positive charge of 26.0 µC uniformly distributed throughout its volume. Calculate the magnitude of the electric field at (a) 0 cm, (b) 10.0 cm (c) 40 cm and (d) 60 cm from the center of the sphere.

Protons

(a) Find the potential at a distance of 1.00 cm from a proton. (b) What is the potential difference between two points that are 1.00 cm and 2.00 cm from a proton. Repeat parts (a) and (b) for an electron.