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Question

A system is executing forced harmonic resonant oscillations. The work done by the external driving force
  1. is equal to maximum K.E.
  2. is equal to maximum P.E.
  3. is equal to total energy
  4. is dissipated by damping forces

A
is equal to maximum K.E.
B
is equal to maximum P.E.
C
is equal to total energy
D
is dissipated by damping forces
Solution
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Generally, work done by external force goes to total energy of the system. But in forced oscillations, it is dissipated by damping forces.

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