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A straight conductor carries a current. Assume that all free electrons in the conductor move with the same drift velocity `v`. `A` and `B` are two observers on a striaght line `XY` parallel to the conductor. `A` is stationary `B` moves along `XY` with a velocity `v` in the direction of the free electrons.

A

A and B observe the same magnetic field

B

A observes a magnetic field, B does not

C

A and B observe magnetic fields of the same magnitude but opposite directions

D

A and B do not observe any electric field

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