Change the chapter
Question
If the potential due to a point charge is $5.00 \times 10^2 \textrm{ V}$ at a distance of 15.0 m, what are the sign and magnitude of the charge?
Question by OpenStax is licensed under CC BY 4.0.
Final Answer

$+8.34 \times 10^{-6} \textrm{ C}$

Solution Video

OpenStax College Physics Solution, Chapter 19, Problem 29 (Problems & Exercises) (0:37)

Sign up to view this solution video!

View sample solution

Calculator Screenshots

OpenStax College Physics, Chapter 19, Problem 29 (PE) calculator screenshot 1
Video Transcript
This is College Physics Answers with Shaun Dychko.  The potential from a point charge is Coulombs constant times the charge divided by the distance from it. And, we can solve this for Q by multiplying both sides by R over K. And then, we get the charge, it's R V over K. So, that's 15 meters times 500 volts divided by Coulomb's constant, 8.99 times ten to the nine Newton meters squared per Coulomb squared. And, that gives a charge of 8.34 times ten to the minus six Coulombs. This is a positive charge because the potential is positive 500 volts.