Ampere force formula

1. F = bil
with the left hand, the four fingers point to the current direction, and let the magnetic inction line pass through the palm of the hand. The thumb is perpendicular to the four fingers. The direction of the thumb is the direction of the force

2.

Ampere force formula: F = ilbsin α， among α Is the angle between the current direction and the magnetic field direction. A straight conctor with I current and l length

The direction of Ampere force is determined by the left hand rule. For any shape of current under the force of non-uniform magnetic field, the current can be divided into many current elements I Δ 50. The magnetic field B at each current element can be regarded as a uniform magnetic field, and the ampere force is Δ F=I Δ L·Bsin α， Adding these ampere force vectors together is the force on the whole current

It should be noted that when the current direction is the same as or opposite to the magnetic field direction, namely α= 0 or π The current is not affected by the force of magnetic field. When the current direction is perpendicular to the magnetic field direction, the maximum ampere force on the current is f = bil. B is the magnetic inction intensity, I is the current intensity, and l is the length of the wire perpendicular to the magnetic inction line

The essence of Ampere force forms the resultant force of Lorentz force on the charge moving in the direction of current. This is the conclusion from the experiment. Similarly, when the moving direction of the charge is parallel to the magnetic field, it is not affected by the Lorentz force

when the current direction is parallel to the magnetic field, the directional moving direction of the charge is parallel to the magnetic field, the Lorentz force is zero, and the resultant ampere force is zero

Lorentz force does not do work because the direction of force is perpendicular to the direction of particle motion. According to the formula of work, w = fscos θ，θ= ninety ° W = 0. The ampere force is perpendicular to the direction of the current in the wire, and not necessarily perpendicular to the direction of movement of the wire. Generally, most of the cases are in the same straight line, so the work done by the ampere force is not zero

3. F = bil (magnetic inction line, current direction and Ampere force direction are perpendicular, otherwise they must be decomposed orthogonally) f: Ampere force B: magnetic inction intensity I: current intensity through wire L: effective length of cutting magnetic inction line

4. F=BIL The direction is left-handed. Can be asked

5. F=ILB

6. F = bil (bil must be vertical)

7. That's easy to understand, sin θ The angle in is the angle between B and L< br />
Bsin θ， It is understood as the component or projection of B in L direction

LSIn θ， The component or projection of L in B direction

8. F = bil (magnetic inction line, current direction and Ampere force direction are perpendicular, otherwise they must be decomposed orthogonally) f: Ampere force B: magnetic inction intensity I: current intensity through wire L: effective length of cutting magnetic inction line

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