Electric Potential & Kinetic Energy

[yOVivo]

Homework Statement

Points A and B have electric potentials of 332 V and 149 V, respectively. When an electron released from rest at point A arrives at point C, its kinetic energy is K. When the electron is released from rest a point B, however, its kinetic energy when it reaches point C is 2K. What is the electric potential at point C? What is the kinetic energy K?

Homework Equations

I don't know exactly what to use, so I'd rather not list all available equations...

The Attempt at a Solution

I tried using Energy Conservation but kept getting a contradiction. The fact that the electric potential at Point A is larger than the electric potential at Point B but the kinetic energy gained while traveling from A to C is less than that from traveling from B to C is confusing me. Help?

 

[LowlyPion]

Welcome to PF.

W = q*ΔV

is likely all you need isn't it?

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elewor.html#c1

 

[nlightner]

I would first commend the student for attempting to solve the problem and using the concept of energy conservation. However, I would also suggest that they check their calculations and equations to see where the contradiction is arising from. It is important to carefully consider all the variables and their relationships in order to reach a correct solution.

In this case, it is possible that the directions of the electric potential and kinetic energy are causing confusion. Electric potential is a measure of the potential energy per unit charge at a certain point, while kinetic energy is the energy an object possesses due to its motion. Therefore, the electric potential at point C would depend on the charge of the electron and its distance from point C.

I would advise the student to review the equations for electric potential and kinetic energy, and carefully consider the direction and magnitude of each variable in relation to the given scenario. It may also be helpful to draw a diagram or visualize the situation to better understand the problem.

Once the correct equations and variables are identified, the student can then solve for the electric potential at point C and the kinetic energy K. It is important to double check the final solution to ensure it aligns with the given information and makes logical sense. If there are still any discrepancies, it may be helpful to seek clarification or assistance from a teacher or classmate.