Question:
A staright conductor of circular cross section carries a current then, which of the following statement is true:
(a)No force act on conductor at any point
(b) An axial force act on conductor to decrease it's length
(c)A radial force acts towards axis tending to reduce it's cross section
(d)A radial force acts away from the axis tending to increase it's cross section
my thoughts( i'm doing some conceptual mistake):
i thought if a current I is going in upwards direction in a straight wire as
shown below :
then, any differential length of wire will experiance no force
but answer is not option (a) (so, wire will experiance force either in radial or axial direction )
thus, i'm having problem in understanding this concept
i'm asking why wire will experiance force from it's own magnetic field. can
anyone explain it to me ?
regards