你描述的“手掌摊开,拇指指向运动方向,四指指向磁场方向,掌心指向力的方向”是安培右手定则(Right-hand Rule for Force),用于确定电流或带电粒子在磁场中受力的方向。这种右手定则适用于洛伦兹力(Lorentz force),即一个带电粒子在磁场中的受力情况。2. 弗莱明右手定则(Fleming’s Right-hand Rule)弗莱明右手...
The Einstein–Hilbert action of the general theory of relativity (GR) is the integral of the scalar curvature R. It is a theory that is drawn from the
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