(b) With r> R, the expression above must replaced by ( )200(2)0.00450 V/m sBrRπεµπ=⋅. Substituting r= 0.050 m and R= 0.030 m, we obtain B= 4.51 ×10−22 T.11. (a) Application of Eq. 32-7 with A= πr2(and taking the derivative of the field expression given in the problem) leads to
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