A charged particle hurtles through space, creating its own magnetic field. If it strikes the earth's magnetic field at the equator, the two magnetic fields interact and _______.
A) do not affect the particles direction
B) change the particle's speed but not its direction
C) change the particle's speed and direction
D) change only the particle's direction
E) bounce it back in the direction it came from
2007-02-28 04:36:20 · 3 answers · asked by nando 1 in Science & Mathematics ➔ Physics
its not C.......
2007-02-28 04:54:46 · update #1
its not B....
2007-02-28 05:03:11 · update #2
its not B....
2007-02-28 05:03:15 · update #3
The answer is D not C.
Magnetic fields do no work, this means that the magnetic field can change the particles direction but not speed.
Proof
F =q(E+v x B)
W=F (dot) X
W = (qv x B) (dot) X = 0
Remember that X is parallel to v and qv x B is perpendicular to v. This means that the dot product will be zero. In order for there to be a change is speed there has to be a nonzero work.
2007-02-28 04:58:41 · answer #1 · answered by sparrowhawk 4 · 0⤊ 0⤋
The particle will experience a transversal force F (perpendicular to both the earth's mag fiel, B, and the particle velocity, v;) given by
F = qvxB where F, v and B are vectors and x represents a cross(vector product)
Therefore the answer is D)
2007-02-28 12:59:29 · answer #2 · answered by physicist 4 · 0⤊ 0⤋
c
2007-02-28 12:46:55 · answer #3 · answered by SteveA8 6 · 0⤊ 1⤋