ch22-p037 - 37. We use Eq. 22-26, noting that the disk in...

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37. We use Eq. 22-26, noting that the disk in figure ( b ) is effectively equivalent to the disk in figure ( a ) plus a concentric smaller disk (of radius R /2) with the opposite value of σ . That is, E ( b ) = E ( a ) σ 2 ε o 1 2 R (2 R ) 2 + ( R/ 2) 2 where E ( a ) = σ 2 ε o
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