Select True or False for each of the following statements regarding magnetism, a

Question

Select True or False for each of the following statements regarding magnetism, and the earth's magnetic field "B."

True False  The vector B acts only on charges at rest.
True False  The direction of B is indicated by the N pole of a magnetic needle .
True False  Like magnetic poles attract.
True False  B does work on a charge only when the charge has a velocity component perpendicular to B.
True False  The earth's B lines are parallel to the earth's surface at all points.
True False  For a bar magnet, the B - lines exit through the N pole and return through the S pole .
True False  The magnitude of earth's B is about 1 Tesla.

Explanation / Answer

false, magnetism is due to poles of the magnet
not charges

True, magnetic field lines have the direction pointing from north to south

FLase, as Like poles repel and unlike poles attract

True as F = q V B sin theta , when theta = 90 deg, F is maximum

FAlse, field lines are perpendicualr to earth surface at all points

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

True The magnitude of earth's B is about 1 Tesla.

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