MP2-1: Charged Aluminum Spheres (spoiler)

MP2-1: PSS 25.1: What's the Point? (spoiler)

MP2-1: Coulomb's Law Tutorial (spoiler)

MP10-2: Induced EMF and Current in a shrinking loop (practice, spoiler)

MP10-2: Induced EMF and Current in a shrinking loop (spoiler)

MP10-2: Understanding changing flux (spoiler)

MP10-2: Magnetic switch light ranking task (spoiler)

MP10-2: Induced Current in a pair of solenoids conceptual question (spoiler)

MP10-2: Conceptual Induction (spoiler)

MP10-1: Faraday's law and induced emf (spoiler)

MP10-1: A simple way to measure magnetic fields (spoiler)

MP10-1: PSS 33.1: Down to the wire (spoiler)

MP10-1: A magnet and a coil (spoiler)

MP10-1: A conductor moving in a magnetic field (spoiler)

MP9-2: Electromagnetic Velocity Filter

MP9-2: Magnetic Field from Current Segments

MP9-2: Part F of Magnetic Field inside a very long solenoid (other parts posted separately) (spoiler)

MP9-2: Magnetic Field inside a Very Long Solenoid (spoiler)

MP9-2: Force on Moving Charges in a Magnetic Field

MP9-2: Ampère’s Law Explained

One of the main things to keep in mind here is that it's the symmetry of the closed path you're integrating along that matters, not the amount / consistency of current passing through.

Symmetry lets you bring B out of the integral.