# Spring in a magnetic field

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

A mass is attached to a spring through which circulates an electric current. Will the mass move?

2. Relevant equations

F = I l $\times$ B ?

3. The attempt at a solution

A spring is geometrically equivalent to a solenoid. Therefore, the current would generate a magnetic field which goes through the spring. What I’m not sure of is whether this magnetic field exerts a force on the solenoid or not.

Thank you.

http://ift.tt/1gscQzE