Why does the coil of wire in a speaker become attracted to or repelled by the permanent magnet on the back of the speaker?

The second speaker's cone and coil will vibrate, causing a change in magnetic field on the magnet, which will induce a current along the wire to the first speaker. The current induces a magnetic field on the first coil, which is then attracted and repelled from the magnet, causing the cone to vibrate and produce sound

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