$A$ point charge is placed in a moving train. $A$ passenger $A$ sitting in the train and a person $B$ standing on the ground observe the fields due to this charge. Then:

  • A
    $A$ observes both electric and magnetic fields
  • B
    $B$ observes both electric and magnetic fields
  • C
    $A$ observes only magnetic field
  • D
    $B$ observes only electric field

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