The magnitude of the electromagnetic force on an electrified conductor in a magnetic field depends on_____ 、_____ , and_______ .

The magnitude of the electromagnetic force on an electrified conductor in a magnetic field depends on_____ 、_____ , and_______ .

F a = b * I * L * Sina
Where a is the angle between B and I
That is to say, the magnitude of the electromagnetic force on an electrified conductor in a magnetic field depends on the magnetic induction intensity B, the current intensity I and the effective length L * sina of the conductor in a magnetic field

The force direction of an electrified conductor in a magnetic field is related to the current direction and the magnetic field direction. If the two directions change at the same time, why is the force direction "not necessarily changed" but not "necessarily changed"?

The force of an electrified conductor in a magnetic field can be judged by the "left-handed rule"
Stretch out your left hand, let the magnetic induction line (arrow in the direction of magnetic field) go through your palm, four fingers point to the direction of current (that is, the direction of positive charge movement), then the direction of thumb is the direction of force on the conductor
In high school, the direction of magnetic field is perpendicular to the direction of current
1. When the magnetic field direction changes 180 degrees and the current direction remains unchanged, the force direction changes to the opposite direction of the original direction
2. When the direction of the magnetic field changes 180 degrees, the direction of the current also changes 180 degrees, the direction of the force does not change!
3. When the magnetic field direction changes to 0-90 degrees and the current direction remains unchanged, the force direction remains unchanged
4. When the direction of the magnetic field changes to 90 degrees and the direction of the current does not change, the conductor is not subject to the magnetic force!
5. When the magnetic field direction changes to 90-180 degrees and the current direction remains unchanged, the force direction changes to the original opposite direction! (University course, is to make the magnetic induction line to the current line projection.)

Why does an electrified conductor act as a force in a magnetic field?

1. Ampere force if the length of conductor L, the current I, is perpendicular to the magnetic field, the magnetic induction intensity is B, the magnitude of Ampere force is f = bil, the direction of Ampere force is judged by the left hand rule: stretch out the left hand, point the four fingers to the direction of current, let the magnetic line of force pass through the palm, the direction of thumb is

The force in the electrified wire and magnetic field
The bar magnet is placed on the horizontal table top, and a long straight wire is fixed above its center. The wire is perpendicular to the magnet, and the inward current of the vertical paper surface is unified in the wire. FN is used to indicate the pressure of the magnet on the table top, and FF is used to indicate the friction force of the table top. After the wire is electrified, it is compared with that before the wire is electrified ()
A. FN decreases, FF = 0, B, FN decreases, FF ≠ 0
C. F n increases, f f = 0, C, f n increases, f n ≠ 0

The direction of the magnetic field above the magnet is a horizontal S pole. The left-handed rule can be used to determine the direction of the magnetic force on the wire (up or down), and its reaction force acts on the magnet in the direction of down or up. According to the balance relationship in the vertical direction, the change of the supporting force on the magnet can be judged, and there is no friction,

How does the magnet bear force in the magnetic field of an electrified wire?

You can think the other way around
First look at the force of the electrified wire in the magnetic field of the magnet, and then judge the force of the magnet in the magnetic field of the electrified wire according to the relationship between the force and the reaction force

How to understand that the direction of current in the electrified wire is parallel to the direction of the magnetic induction wire, and the wire is not affected by the magnetic force? It is best to give an example. Thank you
Why is the force maximum when the current direction is perpendicular to the magnetic field direction?

The finger movement is equivalent to the magnetic line of force movement, along the guitar string movement, the guitar string will not move, the guitar will not sound. When the finger movement direction contains the relative guitar string has the transverse movement component, the string will sound, that is, the transverse movement

Why is an electrified wire subjected to a force when placed in a magnetic field

Electromagnetic effect, electrified wire is equivalent to a magnetic field, so in the magnetic field, of course, it will be affected by the force. I suggest you turn to the high school physics book, there are some professional words I can't remember clearly

Magnetic field of electrified straight wire
Since there is no north-south pole, is the north-south pole direction of the small magnetic needle certain or can it be reversed?
For example, after power on, the small magnetic needle turns perpendicular to the wire. At this time, if the magnetic needle turns 180 degrees, can it be stable

Finally, the magnetic induction line will flow steadily from the S pole to the N pole, provided that the small magnetic needle can rotate in three dimensions, and our usual compass is two-dimensional

An electrified straight wire placed in a magnetic field
A must be under the action of a force
B must not be subjected to force
C is not necessarily affected by the force
Why choose C instead of a? Even in the balance position, it should be affected by the force. Please give the reason

If the direction of the wire and the magnetic field line is parallel, there will be no ampere force. If you want to judge the direction of Ampere force, you use the right hand rule: stretch out the palm of the left hand, the magnetic field direction passes through the palm, the four fingers point to the direction of current, and the thumb point to the direction of Ampere force. You can know that ampere force exists only when the direction of current and magnetic field is perpendicular

There is a magnetic field around the electrified straight wire. If a long wire is wound into a solenoid in one direction and inserted into the iron core, an electromagnet is made
A. After the wire is wound into a solenoid, the magnetic field generated by each turn of the coil is superposed with each other, so the magnetic field is enhanced. B. after the wire is wound into a solenoid, the magnetic field generated by each turn of the coil is offset with each other, so the magnetic field is weakened. C. the magnetic strength of the electromagnet has nothing to do with the current. D. the magnetic strength of the electromagnet has nothing to do with the number of turns of the coil

There are three factors to determine the magnetic strength of electromagnet: the current size, the number of coil turns and the presence or absence of iron core. And: in the case of iron core, the greater the current, the more turns, the stronger the magnetic strength; in the case of the same current size and the number of coil turns, the magnetic strength of electromagnet with iron core is stronger than that without iron core