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1. A parallel-plate capacitor has a plate separation of 13.00 mm. If the material between the...

1. A parallel-plate capacitor has a plate separation of 13.00 mm. If the material between the plates is air, what plate area is required to provide a capacitance of 9.00 pF? (Express your answer to three significant figures.)

2. A parallel-plate capacitor has square plates that have edge length equal to 1.20××1022cm and are separated by 1.00 mm. It is connected to a battery and is charged to 12.0 V. How much energy is stored in the capacitor? (Express your answer to three significant figures.)

3. You charge a 2.00-μμF capacitor to 50.0 V.  How much additional energy must you add to charge it to 110 V? (Express your answer to three significant figures.)

4. A parallel-plate capacitor has a plate separation of 1.5 mm and is charged to 750 V. If an electron leaves the negative plate, starting from rest, how fast is it going when it hits the positive plate? (Express your answer to two significant figures.)

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