A formula for calculating the height of equilateral triangle

A formula for calculating the height of equilateral triangle

The side length of 2 / 3 root is high!

How to find the height formula of equilateral triangle

Pythagorean theorem + sine theorem can be obtained

When two parallel wires pass through the same direction current, do the conductors attract each other?

Yes, the current in the same direction attracts each other, and the current in the opposite direction repels each other

Why do two parallel wires attract each other when there is current in the same direction? Is it related to the theory of relativity?
According to high school physics elective 3 - 1: two parallel wires are connected with current in the same direction, and they attract each other
The interaction between two stationary electrons is the macroscopic manifestation of the interaction between electrons. Two parallel wires with the same direction current can be regarded as two same direction electron flows. Any one of them is relatively stationary for other electrons, but they are gravitational interaction. What is the reason?
Does the interaction between electric currents have nothing to do with the interaction between electrons?

The fundamental principle is electromagnetic effect
An electrified wire will produce a magnetic field, so one electrified wire will be affected by the magnetic field generated by another electrified wire instead of the direct electron
Relativity is about time and space, and this is about electromagnetism. It doesn't matter. Don't think of relativity as soon as there is interaction

As shown in the figure, a long straight wire with current I1 is in the same plane as a rectangular coil with current I2
A. Translation towards straight wire B. translation away from straight wire C. rotation around axis 11 'D. rotation around axis 22'

According to the right-hand screw rule, there is a vertical paper inward magnetic field under the current I1. The ampere force on the left and right sides is equal, and the direction is opposite. According to the left-hand rule, the ampere force on the upper side of the coil is upward, and the ampere force on the lower side is downward, because the closer to the straight wire, the stronger the magnetic field

As shown in the figure, if a rectangular coil is in the same plane as a parallel straight wire with the same current and is in the center of two straight wires, then ()
A. Two currents in the same direction and increasing B. two currents in the same direction and decreasing C. two currents in the opposite direction and increasing D. two currents in the opposite direction and decreasing

A. B. when the current is in the same direction, according to the right-hand spiral rule, the magnetic field generated by the two currents is perpendicular to the coil, and the direction is opposite, and the magnetic flux is zero

As shown in the figure, a long straight wire with current I1 is in the same plane as a rectangular coil with current I2
A. Translation towards straight wire B. translation away from straight wire C. rotation around axis 11 'D. rotation around axis 22'

According to the right-hand screw rule, there is a vertical paper inward magnetic field under the current I1. The ampere force on the left and right sides is equal, and the direction is opposite. According to the left-hand rule, the ampere force on the upper side of the coil is upward, and the ampere force on the lower side is downward, because the closer to the straight wire, the stronger the magnetic field

As shown in the figure, if a rectangular coil is in the same plane as a parallel straight wire with the same current and is in the center of two straight wires, then ()
A. Two currents in the same direction and increasing B. two currents in the same direction and decreasing C. two currents in the opposite direction and increasing D. two currents in the opposite direction and decreasing

A. B. when the current is in the same direction, according to the right-hand spiral rule, the magnetic field generated by the two currents at the coil is perpendicular to the coil, the direction is opposite, and the magnetic flux is zero. Therefore, no matter the current to the coil increases or decreases, the magnetic flux of the coil is always 0, and there is no change, so there is no induced current. Therefore, AB is wrong; when the direction of C, D and current is opposite, the magnetic field generated at the coil is square In the same direction, the magnetic flux generated is not zero. Therefore, whether the current to the coil increases or decreases, the magnetic flux of the coil will change, and there will be induced current

Why are two wires with the same current close to each other?

The direction of the magnetic field of an electrified conductor is related to the direction of the current and the winding method. If the current is the same and the winding is opposite, the magnetic poles are opposite, and the magnetic poles are attracted to each other. Therefore, two wires with the same current will be close to each other

Two wires with electric current are perpendicular to each other. Do they attract each other or repel each other?

Exclusion