Right-Hand Rule(redirected from Right hand thumb rule)
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right-hand rule[′rīt ¦hand ′rül]
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.