4. Let the cylindrical surfaces p= 4 cm and p=9 cm enclose two wedges of perfect dielectrics, e,1 =2 for 0< < 2' and e2 = 5 for 2o< 2m. If E 2000 a, V/m, (a) Find E. (b) Find the total electrostatic energy stored in a Im length of each region.

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