# Why electric potential definition demand the positive sign of test charge?

Why does electric potential definition need to distinct a positive test charge since the result will be the same even with a negative test charge? We could define electric potential with agnostic sign of test charge.

Page 687 from Halliday-Resnick 10 edition: "the electric potential is the amount of electric potential energy per unit charge when a positive test charge is brought in from infinity"

• I don't think you need to distinguish between the two. Where did you read this? – SoterX Oct 20 '20 at 9:25
• Related: physics.stackexchange.com/q/17109/2451 and links therein. – Qmechanic Oct 20 '20 at 9:26
• Page 687 from Halliday-Resnick 10 edition: "the electric potential is the amount of electric potential energy per unit charge when a positive test charge is brought in from infinity" – nonlinearly Oct 20 '20 at 11:40