# Charged particles moved into a B-field

1. Dec 19, 2014

### scrubber

1. The problem statement, all variables and given/known data
Two radioactive isotopes of singly charged plutonium(Pu-249 and Pu-244) are accelerated through a potential difference of 3.00kW and enter a uniform magnetic field of 1.50T directed perpendicular to their velocities. By performing relevat calculations, show that the ratio of the path radii is independent of potential difference and magnetic field.
Given: an atomic mass unit = 1.66*10^-27kg

2. Relevant equations
R=mv/qB

3. The attempt at a solution
How can I start answering this question?
From the equation, both "v" and "B" are involved. So isn't it dependent?

2. Dec 19, 2014

### BvU

A potential difference of 3 kV I hope ? I don't see this V appear in any of your relevant equations, so you need to find something..

What does that 3kV do to singly charged Pu-249 ? And to Pu-244 ?
You may assume they are at rest before being exposed to this potential difference.