# Homework Help: Potential difference

1. Feb 7, 2009

### phy112

1. The problem statement, all variables and given/known data

a uniform electric field has magnitude E = 225 N/C and is directed to the right. A particle with charge +4.3 nC moves along the straight line from a to b.
What is the potential difference Va - Vb between points a and b?

2. Relevant equations

Potential dif=Va-Vb

3. The attempt at a solution

I found the electric force and the work done on the particle. electric force is .968 and the work done is .242

2. Feb 8, 2009

### Redbelly98

Staff Emeritus

1. We would need to know the distance between a & b, and whether they lie "along" the field line or at some angle to the field, in order to answer the question.

3. Are you aware how much a nanoCoulomb is?

4. Electric potential difference can be determined from the work down and the charge.
Hint: units of potential difference are Volts, which are equivalent to Joules per Coulomb.

3. Feb 8, 2009

### phy112

the distance is .25 m.

4. Feb 8, 2009

### phy112

I figured it out. Thanks a lot!!!