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A small current loop can be used as a compass. (a) When it's placed in an...

A small current loop can be used as a compass. (a) When it's placed in an external magnetic field, which plane will it be rotated into, and in which direction will its magnetic dipole moment p point? (b) Will the foop then be stretchedor compressedby B? (c) lf B varies with position, will the loop be forced toward positions where Bis greateror les!? (dl When a charged particle orbits in a magnetic field (see Ex 27-7, pg 7151, p is antiparallelto B. The force on the orbiting particle is inward (centripetal), but on the wire foop it must be outwardfor sl€bility-why?

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