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 straight line XY parallel to the conductor. A is stationary. While B moves along XY with a velocity v in the direction of the free electrons

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A and B do not observe any electric field

A and B observe the same magnetic field

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

A observes a magnetic field, B does not

answer is A, D.

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Detailed Solution

A is stationary and observes the current I. B observes the free electrons to be at rest, but the unbalanced positive charges in the conductor will appear to move in the direction opposite to that of v. Thus, A and B observed the same current and hence the same magnetic field.

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