Question

when a current carying conductor is placed in the direction of the magnetic field it does not experience any force. WHY?

Answer 1

Well.. why would you think it should experience a force?

Answer 2

I think the force is only noted when the current is at an angle to the magnetic field. Normally, in an electric motor the magnetic field is at 90o to the current flow and the force is perpendicular to both (remember Fleming's left hand rule).

Answer 3

Fm=qV^B, and since V and B are in the same direction, Fm=0

Answer 4

i'd say the ans comes from
i(lxB) which is an extension of lorentz force..

Answer 5

well.. force acts on a charged particle only when its velocity is making an angle with the magnetic field.. !! if a charged particle is moving parallel or antiparallel to the field.. then it experiences no force whatsoever... hence when the conductor is parallel, the electrons are moving parallel to the field and thus experience no force at all!..

Answer 6

but what is the physical reason behind this....exactly....

Answer 7

I always thought.. it was because when a charge is moving it produces its own magnetic field.. this magnetic field interacts with the already present external magnetic field and hence produces a force