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+7.6uC charge with mass of 0.13mg is placed 2.54m above -3.61uC/m2 disk of charge with diameter...

+7.6uC charge with mass of 0.13mg is placed 2.54m above -3.61uC/m2 disk of charge with diameter of 0.1m. How fast will charge be going when it falls to 0.83m above the disk?

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