Question

Question 3-8 points To the best of our knowledge the magnitudes of the negative charge on the electron and the positive charge on the proton are precisely equal. Imagine for the purposes of this question, however, that the charge on the proton is slightly larger than the charge on the electron (a) Do some research and determine (i) the number of electrons and the number of protons in a copper atom, and (ii) the mass of a copper atom. (2 Points) (b) Use your answer to part (a) to estimate the total number of protons and electrons in a penny. Next estimate the excess charge on a penny if the charge on the proton is bigger than the charge on an electron by i part in a million (or 0.0001%). Use Coulomb's law to calculate the electric force between two copper pennies if they are held one meter apart. (5 Points) (c) Since pennies do NOT repel each other with any detectable force, what can you conclude about the charges on a proton and on an electron? Does the effect of what seems like a very small, imagined change in the charge of a proton surprise you? G1 Points)

Answer 1

ax 63 S Cu 0) no. 1 elec to not proton= 2.9 maxs a 23 63 5 6.87 xl023 2