# 58567 – if you get me 90%, Ill give you a tip if i could do that

SOLUTION AT Australian Expert Writers

if you get me 90%, Ill give you a tip if i do that hereHomework 6 Due: Aug. 91. Let F~ be some unknown vector field whose curl is given by.Compute the flux of ? × F~ over the top half of the unit sphere centered at the origin.2. Let ~r be the radial vector field ~r = hx,y,zi. The goal of this problem is to show that ~r cannot be written as the curl of some other vector field. In other , it is impossible that a vector field F~ exists such that ? × F~ = ~r.(a) Compute the flux of ~r through the unit sphere centered at the origin.(b) Pretend that was some vector field F~ such that ? × F~ = ~r. Compute the flux of ? × F~.(c) Conclude that ~r cannot be written as the curl of another vector field.3. Find the flux of the vector fieldthrough the surface S bounded by the paraboloic cylinder z = 1 – x2 and the three planes z = 0, y = 0, and z = 2 – y. (Hint: A picture might help!)14. An electrically charged particle sitting at the origin emits a radial electric field E~ given bywhere is a constant, and Q is the (constant) of the particle.According to Gauss’ Law from physics, the (electric) flux of E~ through any closed surface S enclosing the particle is given byThe goal of this problem is to prove Gauss’ Law!(a) Show that ? · E~ = 0.(b) Let S1 be a sphere centered at the origin whose radius R is small enough so that S1 is completely encased within the unknown surface S. Use the Divergence Theorem to show thatZZ ZZE~ · dS~ = E~ · dS.~S S1(Hint: Use the corollary to the Divergence Theorem about the region enclosed by two surfaces.)(c) Using the unit normal vectorto the sphere S1, compute E~ · ~n.(d) Compute RRS E~ · dS~ to complete your proof!5. Consider the unit square R in the uv-plane with vertices (0,0), (1,0), (0,1), (1,1). (a) Show that the of variablesx = u2 – v2, y = 2uvtakes the four sides of the unit square into a region R1 in the xy-plane bounded by:1. The line from (0,0) to (1,0).2. The parabolic arc .3. The parabolic arc4. The line from (-1,0) to (0,0). (b) Use this change of variables to calculateZZ y dA.R12

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