Question

A proton is in an electric field and has an electric potential energy of 0.5 J. What is the electric potential (voltage) that it experiences?

Could someone explain what I did incorrectly? Thank you!!

A) 3.1 E-19 V <--- I chose this answer originally
B) 1.6 E-19 V
C) 3.1 E18 V <----- I'm pretty sure this is the correct answer?
D) 0.5 V
E) 2.0 V

Answer 1

Here's the magic formula: 1 'volt' = 1 joule per coulomb .
Everything else is just arithmetic.

So Voltage = (energy) / (charge)

Voltage = (0.5 J) / (1.6 x 10⁻¹⁹)

= 3.125 x 10⁻¹⁸ .