# Force on an Electron

## Homework Statement

A filament in a light bulb uses a length of wire 6.0cm. The potential difference across the filament is 240V. What is the force on an electron in the filament from the imposed electric field?

F= qE

E = V / d

## The Attempt at a Solution

Hello everyone, thank you for reading this, from what I understand the solution is to substitute the E as V/d to solve this problem, however what I'm puzzled at is why does the length of the wire (6.0cm) is the 'd' in this equation? From what I understand, d is the separation between 2 plates of positive and negative charge, so I'm unsure as to why the 6.0cm applies.

Thank you very much!

Related Introductory Physics Homework Help News on Phys.org
BvU
Homework Helper
2019 Award
Hello BT, A potential difference is between two positions. They can be simple points, or somewhat extended: a line or a plate.
In this exercise they are the end points of the thicker pieces of wire that hold up the filament.

• Hello BT, 