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Damped Oscillations

The Bob of a ...

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The Bob of a simple pendulum is replaced by a magnet. The oscillation are set along the length of the magnet. A copper coil is added so that one pole of the magnet passes in and out of the coil. The coil is shortcircuted. Then which of the following happens? 1) period does not change 2) Oscillations are damped 3) amplitude increases 4) period decreases

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