homework1 - Harvard University Department of Physics Spring Semester 2009 Physics 15b Electricity Magnetism Problem Set#1 Due Friday at 4pm 1(a The

# homework1 - Harvard University Department of Physics Spring...

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Harvard University Department of Physics Spring Semester 2009 Physics 15b Electricity & Magnetism Problem Set #1 Due Friday, February 13, 2009 at 4pm 1. (a) The distance between two protons in a helium nucleus is 10 - 13 cm. Compare the gravitational attraction of these 2 protons to their electrostatic repulsion. (b) What holds the protons together? How strong must this force be? 2. A thin rod 10 cm long carries a total charge of 8 esu uniformly distributed along its length. Find the strength of the electric field at each of the two points A and B located as shown in the diagram below. 10 cm A 3 cm B 5 cm 3.(a) The sphere of radiusawas filled with positive charge at uniform densityρ.Then asmaller sphere of radiusa/2 was carved out, as shown in the figure, and left empty.What are the direction and magnitude of the electric field atA? (b) At B ? A B a r

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