For a current distribution in free space, A = (18x 3 y + 5y 2 z) ax + ( ̶ 3x 2 y 2 k + xz 2 ) ay ̶ (18x2 yz – 2x 2 y 2 ) az Wb/m Calculate the following: (a) Find the ∇ • A. (b) Under which possible condition the ∇ • A = 0
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