What is the force between two magnets with different magnetic field strengths?

[dymand68]

Homework Statement

Magnet A has twice the magnetic field strength of magnet B and at a certain distance pulls on magnet B with a force of 55 N. With how much force, then, does magnet B pull on magnet A?

Homework Equations

unknown

The Attempt at a Solution

unknown

 

[Delphi51]

Look up Newton's Third Law.