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.

Options

A. `A` and `B` observe the same magnetic field.
B. `A` observes a magnetic field `B` does not.
C. `A` and `B` observe magnetic fiels of the same magnitude but opposite directions
D. `A` and `B` do not observe any electric field.

Answer

A, D