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With the battery connected, fill the gap by a slab with the dielectric constant 4.5.

If the potential is 90 V, the plate sep- aration is 0.7 mm, and the plate area is 70.4 cm2, find the electric charge on the plate. The value of the permittivity of free space is 8.8542 × 10-12 C2/N · m2.

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