1 mm above the center of the top surface of the plate.
Given:
Radius of the plate, r = 7.5 cm = 0.075 m
Charge on the plate, Q = -3.6 nC = -3.6 x 10^-9 C
Distance above the center, h = 0.1 mm = 0.1 x 10^-3 m
Use the formula for electric field due to a charged disk
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