Select True or False for each of the following statements regarding magnetism, a
ID: 1538740 • Letter: S
Question
Select True or False for each of the following statements regarding magnetism, and the earth's magnetic field "B" B does work on a charge only when the charge has a velocity component parallel to B. The earth's B lines are parallel to the earth's surface at all points. Unlike magnetic poles attract B does work on a charge only when the charge has a velocity component perpendicular to B. The magnitude of earth's B is about 1 Tesla For a bar magnet, the B-lines exit through the N pole and return through the S pole The vector B acts only on charges at rest.Explanation / Answer
when velocity component is parallel to B then magnetic force will be zero.
F = q (v x B) = 0 (cross product is zero when both vectors are in same direction)
False.
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True:
earth lines are parallel to surface. Line emerges from grographic south pole and exit on geographic north pole.
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True
Unlike pole attract and like pole repel.
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F = q ( v x B)
v and B are perpendicular then F will be perpendicular to both v and B.
so F will always be perpendicular to v hence work done will be zero.
W = F.d (F and d perpendicular and dot product will be zero)
False
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False
B due to earth is range of 10^-5 T
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True"
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when charge is at rest.
v = 0
F = q (vx B) = 0
False