37. We use Eq. 22-26, noting that the disk in figure (b) is effectively equivalent to the disk in figure(a) plusa concentric smaller disk (of radius R/2) with the oppositevalue of σ. That is, E(b)= E(a)– σ2εo⎝⎜⎛⎠⎟⎞1 −2R(2R)2+ (R/2)2where E(a)= σ2εo⎝⎜
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