The following figure shows an electrostatic precipitator. Identify $P, Q,$ and $R$.

  • A
    Negatively charged wire,Dust particles,Discharged corona
  • B
    Discharged corona,Dust particles,Negatively charged wire
  • C
    Negatively charged wire,Discharged corona,Dust particles
  • D
    Discharged corona,Negatively charged wire,Dust particles

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