Paramagnetism and Magnetic Resonance: Feynman's Physics Explained
Treated with quantum mechanics, paramagnetism reveals that atomic magnetic moments can only point in a discrete set of directions relative to a field. Transitions between these energy levels can be driven by an oscillating field at a precise resonant frequency. This nuclear magnetic resonance is an exquisitely precise tool for probing molecular structure — and is the physics behind medical MRI scanners.
The big idea
Magnetic resonance lets us read the inside of molecules — and bodies.
Think about it
How could flipping the magnetic spins of atoms inside you produce a detailed image of your body?
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