Which of the following statements for magnetism are true? A) The magnitude of ea

Question

Which of the following statements for magnetism are true?

A) The magnitude of earth's B field is about 1E-4 Tesla.

B) For a bar magnet, the B-lines exit through the N pole and return through the S pole.

C) Magnetic fields do work on a charge when the charge has a velocity component parallel to B.

D) A charged particle in the presence of a uniform magnetic field perpendicular to the velocity vector must travel in a circular path (assuming no other forces are acting).

E) Magnetic fields do work on a charge when the charge has a velocity component perpendicular to B.

F) A magnetic field acts only on charges at rest.

G) Unlike magnetic poles attract.

Explanation / Answer

B) For a bar magnet, the B-lines exit through the N pole and return through the S pole.

D) A charged particle in the presence of a uniform magnetic field perpendicular to the velocity vector must travel in a circular path (assuming no other forces are acting).

E) Magnetic fields do work on a charge when the charge has a velocity component perpendicular to B.

G) Unlike magnetic poles attract.

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