Reason (R): Charge is always associated with mass.
Solution:
Assertion (A) is true, considering 'mass' as rest mass, which is invariant, similar to charge. Reason (R) is true: All charged particles possess mass; a massless particle cannot carry charge.
(R) is not the correct explanation for (A), as invariance of charge and rest mass are fundamental properties, not directly explained by their association.
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