Physics Asked on January 23, 2021
In this video demonstration of Lenz’s law, the narrator starts with a substance which doesn’t respond to the magnetic field of a bar magnet yet when he moves the bar magnet in relative motion to the copper coil, the coil responds by producing an oscillatory motion.. so, this leads to my question: Why does the
non magnetic copper coil able to respond only to the change of magnetic field ?
Short answer: the motion of the magnet represents a change in the magnetic field across the coil. The changing magnetic field induces currents in the coil. The currents create a magnetic field of their own. Thus the coil becomes, briefly, magnetic and the magnet is able to move it.
Answered by Kristoffer Sjöö on January 23, 2021
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