سوال ۲۲ کنکور ارشد مهندسی برق ۱۴۰۴

PASSAGE 3 (paragraph 1):

Let's start with the basics. A superconductor is a material where electrical resistance disappears and a magnetic field is created. More simply, when you put electricity into a superconductor, you do not lose any energy—a multimeter would register zero volts and zero ohms on a live circuit—and it becomes a magnet. [1] We have known about superconductors since 1911, when a Dutch physicist named Heike Kamerlingh Onnes observed that when he immersed mercury wire in liquid helium, bringing its temperature down to within just a few degrees of Absolute Zero (-273.15°C or 4.2 Kelvin, to be precise) its electrical properties abruptly changed. He wrote, "Mercury has passed into a new state, which on account of its extraordinary electrical properties may be called the superconductive state." [2] In 1913, he won the Nobel Prize in Physics for his work.

22- Which of the following techniques is used in paragraph 1?