Select True or False for each ofthe following statements regarding magnetism, an

Question

Select True or False for each ofthe following statements regarding magnetism, and the earth'smagnetic field "B."

1.The earth's B lines are parallel to the earth's surface at allpoints.
For a bar magnet, the B - lines exit through the N pole and returnthrough the S pole .
2. The magnitude of earth's B is about 1 Tesla.
3. B does work on a charge only when the charge has a velocitycomponent parallel to B.
4. The vector B acts only on charges at rest.
5. B does work on a charge only when the charge has a velocitycomponent perpendicular to B.
6. Like magnetic poles attract.

Explanation / Answer

F: Opposite poles attract. F: As long as the velocity isn't parallel to the field B, workis done. [F=qvBsin] T F: No work is done, because =0, so the force is zero,and W=Fd F: The magnetic field acts on everything, moving or not. F: Not even close - more like 30-60 microTeslas dependingwhere on the earth's surface you are. T

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