# Question anyone dare to answer?

1. Dec 27, 2004

### metz143

Question1: A uniform electric field is parallel to the x-axis. Inwhat direction can a charge be displace in this field without any external work being done on the charge?

Question2: Why is it that under static conditions, all points in a conductor must be at the same electric potential?

Happy answering & happy new year! :rofl:

Last edited: Dec 27, 2004
2. Dec 28, 2004

### Andrew Mason

The definition of work is $W = \vec F \cdot \vec d = qE cos\theta d$. So if no work is done, the displacement must be in the direction perpendicular to the force ie $cos\theta = 0 \rightarrow \theta = \pi/2$

In a conductor, the population of free electrons are free to move. So a free electron will move if there is an electric potential difference between it and another charge. So if there is no motion, there can be no potential difference between charges.

AM