74. (a) The length dis effectively shortened by bso C'= ε0A/(d – b) = 0.708 pF. (b) The energy before, divided by the energy after inserting the slab is 2020/()/ 25.001.67./ 2/5.00 2.00Ad bUqCCdUqCCAddb′−======′′−−(c) The work done is
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