| 释义 |
right-hand rule
right-hand rulen. Physics A rule that uses the shape of the right hand to establish the standard orientation of vector quantities normal to a plane, especially when calculating a vector product or the helicity of particle spin. For example, in the case of spin, the fingers of the right hand should curl in the direction of rotation; the thumb then points in the direction of the spin vector.
Right-Hand Rule
right-hand rule[′rīt ¦hand ′rül] (electromagnetism) For a current-carrying wire, the rule that if the fingers of the right hand are placed around the wire so that the thumb points in the direction of current flow, the fingers will be pointing in the direction of the magnetic field produced by the wire. Also known as hand rule. For a moving wire in a magnetic field, such as the wire on the armature of a generator, if the thumb, first, and second fingers of the right hand are extended at right angles to one another, with the first finger representing the direction of magnetic lines of force and the second finger representing the direction of current flow induced by the wire's motion, the thumb will be pointing in the direction of motion of the wire. Also known as Fleming's rule. Right-Hand Rule a mnemonic rule for determining the direction of the current induced in a conductor moving through a magnetic field. According to this rule, if the right palm is held in such a way that the extended thumb coincides with the direction of motion of the conductor and the lines of force of the magnetic field are entering the palm, then the direction of the current induced in the conductor coincides with the direction of the extended fingers. The right-hand rule follows from Lenz’s law. |