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Calibrating instruments…
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Moving charges make fields, and fields push currents back.
The CBSE Class 12 magnetism chapters, hands-on: send current through a straight wire or a coil and probe the magnetic field it makes, feel the force on a current-carrying conductor in a field, watch a charged particle spiral in a magnetic field, and deflect a compass to weigh the Earth's own field with a tangent galvanometer. All from the Biot–Savart and Lorentz laws.
Beyond the open showcase, subscribed schools get the growing library of Magnetism experiments — searchable, tagged by concept and difficulty, and expanding continuously.