Particles and their anti-particles have

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(B) By definition,a particle and its corresponding anti-particle have the same mass and the same spin,but opposite charges and opposite magnetic momen

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the same masses but opposite magnetic moments

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(B) By definition,a particle and its corresponding anti-particle have the same mass and the same spin,but opposite charges and opposite magnetic moments.Since the magnetic moment $\mu$ is related to the angular momentum (spin) $S$ by the relation $\mu = g \frac{q}{2m} S$,where $q$ is the charge and $m$ is the mass,changing the sign of the charge $q$ while keeping mass $m$ and spin $S$ constant results in an opposite magnetic moment.Therefore,particles and their anti-particles have the same masses but opposite magnetic moments.

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