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Multiple Choice
Which statement best describes magnetic fields?
A
A magnetic field is a vector field produced by moving electric charges and magnetic dipoles, and it exerts forces on moving charges and magnetic moments.
B
A magnetic field is identical to an electric field and always points from positive to negative charge.
C
A magnetic field exists only inside permanent magnets and is zero everywhere outside them.
D
A magnetic field is a scalar field that acts only on stationary electric charges.