Exam 2 review

Chapter 21-Problem 57  

Chapter 22-Problem 27 27. Two thin concentric spherical shells of radii r1 and r2 contain uniform surface charge densities σ1 and σ2 respectively (see Fig. 22–31). Determine the electric field for 0<r<r1, b) r1<r<r2 , and c) r>r2, (d) Under what conditions will E=0 for r>r2, (e ) Under what conditions will E=0 for r1<r<r2

Chapter 22-Problem 34 34.(II) A very long solid non-conducting cylinder of radius R0 and length l (R0<<l) possesses a uniform volume charge density ρE (C/cm3) Fig. 22–34. Determine the electric field at points (a) outside the cylinder (R>R0) and (b) inside the cylinder (R<R0) Do only for points far from the ends and for which R<<l

Chapter 23-Problem 28 28. (II) Point a is 26 cm north of a -3.8μC point charge, and point b is 36 cm west of the charge (Fig. 23–27). Determine (a) Vb-Va and (b) Eb-Ea (magnitude and direction).

Chapter 23-Problem 29 29.(II) How much voltage must be used to accelerate a proton (radius 1.2X10-15m ) so that it has sufficient energy to just “touch” a silicon nucleus? A silicon nucleus has a charge of +14e and its radius is about3.6X10-15m. Assume the potential is that for point charges.