A book sits on a desk. Which of the following must happen before an electrical force can act on the book? A magnet must be placed by the book
Electricity must flow through the book
The book must start moving across the desk
An electrical charge must build up on the book

Membrane vesicles containing an internal sodium chloride (nacl) concentration of 0.14 m are placed into separate beakers each containing a different solution. the first beaker contains 0.14 m sucrose, while the second beaker contains 0.14 m calcium chloride (cacl2). the temperature is 25°c. what is the solute potential inside the vesicles, expressed in units of mpa?