Exam 2: Gausss Law

The nucleus of lead-208, , has 82 protons within a sphere of radius 6.34 * 10-15.Each electric charge has a value of 1.60 *10-19 C.Assuming that the protons create a spherically symmetric distribution of charge, calculate the electric field at the surface of the nucleus.

Which one of the following is not an expression for electric charge?

A small metal sphere is suspended from the conducting cover of a conducting metal ice bucket by a non-conducting thread.The sphere is given a negative charge before the cover is placed on the bucket.The bucket is tilted by means of a non-conducting material so that the charged sphere touches the inside of the bucket.Which statement is correct?

The nucleus of a hydrogen atom, a proton, sets up an electric field.The distance between the proton and electron is about 5.1 *10-11 m.What is the magnitude of the electric field at this distance from the proton? [The charge on the proton is +1.6 *10-19 C.]