charge with surface charge density σ = 4.50 ×10−12 C/m2 plus a small circular pad of radius R = 1.80 cm located at the middle of the sheet with charge density –σ. We denote the electric fields produced by the sheet and the pad with subscripts 1 and 2, respectively. Using Eq. 22-26 for 2EG, the net electric field EGat a distance z= 2.56 cm along the central axis is then
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