The bob of a simple pendulum is replaced by a magnet. The oscillations 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 short-circuited. Then which one of the following happens
A. Period decreases
B. Period does not change
C. Oscillations are damped
D. Amplitude increases

Hint: A simple pendulum is a machine in which the point mass is hung from the fixed support by a light and an inextensible string. The mean position of a simple pendulum is shown by a vertical line which is flowing through a fixed support.

Complete step by step solution:
In order to know that the real simple pendulum's time period is unaffected by changes in amplitude, its time period fluctuates in response to variations in the acceleration caused by gravity. The acceleration due to gravity can also be calculated or verified using this characteristic. And, the period of basic pendulum that is influenced by length of the string to Bob tied also.

And adopting the small-angle approximation, the motion of a simple pendulum is only considered to be a simple harmonic motion when the oscillation is modest or the amplitude of the oscillation is very small in comparison to two lengths of the string. When the bob is tilted at an angle, the pendulum begins to oscillate, and for small values of tilt, the oscillation is just a harmonic motion that tracks the bob's angular displacement.

A magnet stands in for a simple pendulum's bob. The magnet's length is where the oscillations are spaced. One magnet pole is passed in and out of a copper coil that has been installed. The coil has shorted out. The magnetic field created by the coil causes oscillations to be dampened at that point. It is therefore caused by the magnetic field that the coil produces.

Thus, the correct option is C.

Note: It should be noted that the period of a simple pendulum can be increased by lengthening the length of the string while measuring it from the point of the suspension to the middle of the bob. Even if the mass of the bob is altered then the period remains unchanged.