Electric fields

What is the sign of the charge the balloon acquires?
How many electrons are transferred between the balloon and Kat?
How do the charges of the balloon and Kat compare?
A +125 mC charge is moved past a point in a conductor in 25.0 ms. What is the value of the electric current involved in this movement?
An electrical discharge between a cloud and a lightning rod has a current of 1250 A for a time of 1.25 ms. How much electric charge was involved in this lightning strike?
If the charges are located in air, or vacuum, what is their electric force? Is it attractive or repulsive?
If the charges now have a 0.625 mm layer of mica between them, what is the new electric force between them? Assume this purity of mica has a permittivity of 7.50 times that of free space.

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