A car left skid marks 78 m long on a road as it slid to a stop. If the car's acceleration was -3.9 m/s2, what was its velocity b
1 answer:
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B. The initial velocity has components both parallel and perpendicular to the magnetic field.
Explanation:
When a charged particle moves in a magnetic field, it experiences a force which is given by
where
q is the charge
v is the velocity of the particle
B is the strength of the magnetic field
is the angle between the directions of v and B
From this formula, it is clear that the force has only a component in the direction perpendicular to direction of the the motion of the particle. Therefore:
- if the initial velocity is perpendicular to the magnetic field, then the particle will follow a perfectly circular path
- If the initial velocity is parallel to the magnetic field, then the particle will continue moving straight, since it will experience no force
- If the initial velocity has components both parallel and perpendicular to the magnetic field, then it will move in a helical or spiral path, which is a composition of the two motions above (straight motion + circular motion)