Question

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

Answer 1

The last one and the second one

Step-by-step explanation:

Both of those are technically correct. There must be a charge through the book before an electrical force can act on it. Id have to say the last one