I made a 3D printable update of "Current Balance Lab" set up that was originally designed by Rex Rice and Michael Crofton. It's posted on Thingiverse here. This version uses the magnets from the @verniers Dynamics carts. #iteachphysics thingiverse.com/thing:5451425
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@PhysicsRandall @verniers I suppose that is more accurate than the old Macalaster ones I have, where you measure the magnetic force by placing a small piece of thread on the end of the balance that is not inside the solenoid.