What is the principle which Ansari Sir is trying to demonstrate?

15 Ansari Sir was demonstrating an experiment in his class with the setup as shown in the figure below.

A magnet is attached to a spring. The magnet can go in and out of the stationary coil.

He lifted the Magnet and released it to make it oscillate through the coil. Based on your understanding of the phenomenon, answer the following questions.

a. What is the principle which Ansari Sir is trying to demonstrate?

Ans : a. Sir is trying to demonstrate the principle of Electromagnetic induction.