# Difficult problem

1. Feb 27, 2006

### brad sue

Hi, I have this problem that is very difficult for me and I really need some help:

A particle of charge -q and mass m moves in a circular orbital of radius R about a fixed charge Q. The angular frequency for the orbit is given by

wo^2=qQ/(4*pi*(epsilon zero)*m*R^3)

An uniform magnetic field of magnitude B in a direction prependicular to the plane of the orbit is turned on. As a result, the angular frequencyis changed to wo+dw.
Assuming that B is sufficiently small so that products of B and dw can be neglected, calculate dw.

Please can I have some suggestion to start this problem?

Thank you

B

2. Feb 27, 2006

### Staff: Mentor

3. Feb 27, 2006

### Tide

I'm not sure whether the problem intends for you to consider this but the addition of the magnetic field changes the kinetic energy of the charge due to the induced EMF of a changing magnetic field.

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