Problem 4.(adsbygoogle = window.adsbygoogle || []).push({});

Given: k_e=8.98755*10^9 nm^2/C^2 and g=9.8 m/s^2.

find the potential differnece between a point infinitely far away and a point 1.4 cm from a proton. Answer in units of V.

Note: I don't know where to start!

Problem 6.

Given: k_e=8.98755*10^9 nm^2/C^2 and g=9.8 m/s^2.

Four particles with charges of 7.7 C, 4C, 3.3 C AND -5C ARE PLACED AT THE CORNERS of a (2.1m*2.1m) square.

Determine the potential difference between the center of the square and infinity. Answer in units of V.

Note: what formula should I use?

Problem 7.

Given: k_e=8.98755*10^9 nm^2/C^2 and g=9.8 m/s^2.

An electron that is initially 57 cm away from a proton is displaced to another point.

If the change in the electrial potential energy as a result of this movement is 2.2*10^-28 J, what is the final distance between the electron and the proton? Answer in units of m.

Note: I don't know where to start.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Potential difference problems

**Physics Forums | Science Articles, Homework Help, Discussion**