This is Dr. Yuan Xin, who lost his right arm when he was three years old. He wrote his life with one hand. Life was cruel to him, but he rose to the challenge and gave him infinite love. As long as we don't regard ourselves as the weak, our fate will eventually be trampled underfoot. That's why I said that.
Introduction:
The nouns left hand and right hand are opposite. People who are used to doing things with their left hands are called "left-handed". Doing things with your left hand, such as writing, is different from your right hand, so some people use their left hand to exercise.
Lay your left hand flat, with your palm pointing to the N pole of the magnet, so that your thumb is perpendicular to the other four fingers, all in the same plane as your palm. Put your left hand in a magnetic field, let the magnetic induction line pass through the center of the hand vertically, and the four fingers point to the direction of current, then the direction of thumb is the direction of conductor stress.