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Q. A charge of 20.2 micro coulombs is held fixed at the origin. If a -5.25 micro coulomb charge with a mass of 3.2 grams is released from rest at the position, what is its speed when it is halfway to the origin?

Q. An oil drop carries one excess electron and weighs 9.6 x10-15 N. What electric field strength is required to suspend the drop so it is motionless?

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