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Visualization of Maxwell’s equations. Showing electric flux from charge, divergence-free magnetic fields, electromagnetic induction, displacement current, and coupled electric and magnetic fields propagating through vacuum as light.

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Philosophy Of Physics

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James Clerk Maxwell unified electricity and magnetism into a theory of electromagnetism by adding a displacement current term to Ampère's Law and combining it with Faraday's Law of electromagnetic induction, showing that electric and magnetic fields are interconnected. .
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James Clerk Maxwell unified electricity and magnetism into a theory of electromagnetism by adding a displacement current term to Ampère's Law and combining it with Faraday's Law of electromagnetic induction, showing that electric and magnetic fields are interconnected. .

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A research team developing minimally invasive surgical technologies has demonstrated remote magnetic levitation for moving objects inside the body. Their objective is to control guidewires and catheters using magnetic fields. Because magnetic levitation is inherently unstable, it requires solving difficult control challenges, including nonlinear magnetic field behavior, real-time system modeling, and control algorithms that can operate across different electroMagnetic Navigation Systems (eMNS) and device types. A key challenge is tracking position and orientation. Once a catheter or microrobot is inside the body, direct visual feedback is often unavailable, leaving researchers to rely on magnetic field and current measurements for localization and control. Credit: Jasan Zughaibi, Dominik Isler, Michael Muehlebach, and Bradley J. Nelson Video Credit: Jasan Zughaibi #engineering #technology #levitation

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Magnetic levitation for surgical robots! 🧲 A research team working on minimally invasive surgery just introduced a remote magnetic levitation to move things inside our bodies. Their main goal is to control guidewires and catheters inside the body using magnetic fields. But levitation is unstable and extreme, it forces them to solve fundamental control problems they can't avoid. They have to handle strong magnetic field nonlinearities, develop real-time invertible models, and create control methods that work on any eMNS (electroMagnetic Navigation System) and any object. The real challenge is the position and orientation feedback. You can control a magnet outside the body, but once a catheter or drug-delivery robot is inside a patient, you can't see it. There's no vision, but just magnetic fields and current measurements. That's huge news coming out of ETH Zurich! Here's the paper: Mentioned all authors on Li, but coulnd't find them here! ~~ ♻️ Join the weekly robotics newsletter, and never miss any news →

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About 41,000 years ago, during the Laschamp Geomagnetic Excursion, Earth's magnetic field weakened drastically, dropping to just 5% of its current strength. This means that Earth’s natural magnetic shield, which normally protects us from harmful space radiation, was almost entirely gone. The magnetic field lines (seen as white or blue strands) became twisted and chaotic, showing how disordered the field became during the excursion. Normally, these lines flow smoothly from pole to pole, but during this event, they bent, broke, and tangled. The Earth turns red in the visualization, indicating an extremely weak magnetic field. The red color means the planet was barely protected from solar and cosmic radiation. This visualization was created by scientists from DTU and GFZ using data from ESA’s Swarm mission. It includes a stereo soundscape and a visual tracing of the magnetic field lines. This event caused abrupt climate change and mass extinction, and the same thing is happening today!

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