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# plugin-FExRevProb - Math 255 Winter 2010 Review problems...

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Math 255 Winter 2010 Review problems for Final Exam 1. The electrostatic potential at (0 , 0 , - a ) of a charge of constant density σ on the hemisphere S : x 2 + y 2 + z 2 = a 2 , z 0 is U = Z Z S σ p x 2 + y 2 + ( z + a ) 2 dS. Show that U = 2 πσa (2 - 2). 2. Find the value of the line integral Z C yzdx + xydy + xzdz where C is the curve with initial point P 0 = (1 , 0 , 0) given by. a) x = cos t , y = sin t , z = t 2 with t [0 ]. b) The line segment between P 0 and ( - 1 , 0 , - π ). c) The ellipse x 2 + 4 y 2 = 1 and z = 0 parametrized clockwise. d) The circle x 2 + y 2 = 9 and z = 0 parametrized counterclockwise as viewed from above. Use the fact that the path C is the boundary of the region x 2 + y 2 9 with z = 0. Use Green’s Theorem to compute value of the line integral. e) The same path as in part d ), but now using Stokes Theorem. Use the fact that the path C in this case is the boundary of the hemisphere x 2 + y 2 + z 2 = 9 with z 0. f) Can you use the fundamental theorem of line integrals to compute the value of any of the above

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plugin-FExRevProb - Math 255 Winter 2010 Review problems...

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