A small current loop can be used as a compass. When it\'s placed In an external
ID: 1550386 • Letter: A
Question
A small current loop can be used as a compass. When it's placed In an external magnetic field, (a) which plane will it be rotated into, and how will the direction of its magnetic dipole moment mu compare to that of B? (b) Will the loop then be stretched or compressed by B? (c) If B is spatially uniform, will it exert a net force on the loop as a whole (if so, in which direction)? (d) If B varies with position, will the force on the loop be directed toward positions where B is greater or less? (e) When a charged particle orbits in a magnetic field (see Ex 27-7, pg 715), its magnetic dipole moment is antiparallel/to B. The force on the orbiting particle is inward (centripetal), but on the wire loop it must be outward for stability-explain.Explanation / Answer
a. Loop will be rotated in the plane of magnetic field i.e parallel to earth magnetic field. Magnetic dipole moment and B will be in the same direction.
b. Loop will be stretched as magnetic force will act outward.
c. Net force will be zero as forces in all the directions are zero.
d. Net force will be in the direction of the greater force.
e. Need Ex 27-2, Page 715. for this part.