Reason (R): Under forced oscillation phase of harmonic motion of the particle differs from the phase of the driving force.
Solution:
Assertion (A) is true: Forced oscillations involve an external periodic force to maintain motion. Reason (R) is true: In forced oscillations, a phase difference exists between the driving force and the particle's motion. (R) describes a property of forced oscillations, but doesn't explain the reason for applying the external force as stated in (A).
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