How does a battery work to levitate a piece of paper?

The principle of using batteries to levitate paper pieces is the principle of magnetic levitation.

Magnetic levitation technology.

The system is composed of four parts: rotor, sensor, controller and actuator, of which the actuator includes an electromagnet and a power amplifier.

Two parts. Suppose that the rotor deviates from its reference position when it is disturbed downward by a downward disturbance, the sensor detects the displacement of the rotor away from the reference point and acts as the controller's microprocessor.

The detected displacement is converted into a control signal, which is then converted by the power amplifier into a control current, which generates a magnetic force in the execution magnet to drive the rotor back to its original equilibrium position. As a result, the rotor is always in a stable equilibrium state, regardless of downward or upward disturbances.

Maglev trains.

That's how it works. High-speed maglev is the commanding heights of current rail transit technology, with only 10 mm of clearance between the track and the train, which is a real flight close to the ground, involving aerodynamics.

In the current special period when some countries launched a technical blockade on China, the high-speed maglev train off the assembly line makes China in a leading position in this field.

Blow on the top of the paper with something! Because fluids have one property: the pressure where the flow rate is large is less than where the flow rate is small!

Airplanes are made using this principle, the area of the upper surface of the wing is larger than the area of the lower surface (the top is a little convex), and when it passes through the air, the air flow through the upper surface is faster than the air flow on the lower surface, so the gas pressure below is greater than that above, and the wing is lifted up...The greater the difference in the speed of the airflow, the greater the pressure difference (the pressure of the air is very large, but our body can't feel it)! So you blow on the top of the paper so that the air above the paper flows faster than on the bottom, and the air can hold it up, but it takes some skill to keep it levitated.

What is the principle of anti-Flurry paper suspension? This should be a kind of physics knowledge, and it is better to explain it clearly with a physics teacher.

(1) When the tire of the car driving on the road with ice and snow is wound with iron chains, the friction is increased by increasing the roughness of the contact surface when the pressure is constant;

2) The working principle of the maglev train is to use the maglev to make the train disengage from the guide rail, reduce friction, and thus increase the speed;

3) He wiped it clean with a little effort, and increased the friction by increasing the pressure while the roughness of the contact surface remained the same

So the answer is: enlarge; Minish; Stress

1) Because aluminum is a metal, it has electrical conductivity, the aluminum surface at both ends of the aluminum paper strip is directly in contact with the positive and negative poles of electricity or the middle pool, and the resistance at the thinnest part of the aluminum paper strip is larger, forming a short circuit in the power supply of the shirt vertical mountain, at this time, a large amount of heat is quickly generated in the circuit to make the temperature reach the ignition point of the tin foil and make it burn

2) The plastic straw B rubs against the paper towel to produce an electric charge, so B can attract the straw A; If straw A also rubs against a paper towel, it will repel with straw B because the same charge repels each other

Therefore, the answer is: (1) conductive; Big; Big; (2) It can attract small and light objects; The same kind of charge repells each other