Force of a solenoid on a magnet?

[strathcona93]

I'm trying to calculate the force between a solenoid and a magnet inside that solenoid. Would someone be able to explain how I would be able to calculate the force a solenoid of n number of turns and l length with a current I running through it would put on a magnet whose center is a distance d from the centre of the solenoid? any help would be much appreciated. Thanks!

 

[Curl]

There wouldn't be a force on the magnet. Torque yes, but no net force.