Fill in the blank (Physics question - static electricity)

[slipgun]

Sorry for the silly question but I need the right answer to this.

Only _______ confirms that an object is charged. My best shot at the answer is "repulsion."

 

[Grinchy]

Perhaps magnetism or a magnetic field?

 

[Jzero]

ONly getting zapped confirms an object is charged.
Make that WAS charged. Now it's DIScharged.