Which of the following is true? a. a current carrying loop of wire tends to line

Question

Which of the following is true?
a. a current carrying loop of wire tends to line up with its plane parallel to an external magnetic field in which it is postponed.
b. a magnetic field line is, by definition, tangent to the direction of the magnetic force on a moving charge at a given point in space.
c. the magnetic force on a current carrying wire is greatest when the wire is parallel to the magnetic field
d. the magnetic force on a moving charge does not change its energy
e. magnetic field lines have as their sources north and south poles

Explanation / Answer

E) The magnetic force on a moving charge does not change its energy.

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